Description. Does it make a big difference? colt A1E1 733 uppers didn't have extended carbine feedramps ? I have done the same, protect the Barrel extension with a layer of electrical tape and carefully file or Dremel the ramps into the aluminum receiver. This is a big tip, by the way, for pistol-caliber ARs. Amazing what happens in a thread over a simple question. If it's happening regularly, check the magazines you are using for serviceability. M4 Barrel Extension (M4 Feedramps) $22.95 (4 reviews) SKU: Barrel-Extension-M4 Stock Status: Quantity: Add to Wish List Description For your AR15, M16, M4. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. 3. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. America's Ultimate Shooting Sports Discounter, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window). Get The Best Trigger Pull Gauges To Make Every Shot Count. This is why you can use a barrel with an extension with M4 feedramps with a receiver that does not have feedramps, but you cannot use a receiver with M4 feedramps with a barrel with an extension with rifle feedramps. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Don't forget read more information about it here! Interesting reading. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. I wouldn't be concerned at all with any wear after modifying an upper receiver. By Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. The leading cause that leads to the development of the M4 feed ramp is the gas pressure from the carbine gas system that is increasing along with a high cyclic rate. The M4 was the first (allegedy) carbine length gas system. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. ago KrinkyDink2 9 hr. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? The rifle-platform M16s dont use them. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). You need to match up barrels to receivers for optimum performance. JavaScript is disabled. Press question mark to learn the rest of the keyboard shortcuts. Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. Somwhere in the 1990s I believe, Colt designed the M4 feed ramps, where they took some of the material out of the upper receiver, cut two little ramps in it and then cut the ramps in the barrel extention a little further forward. The trust part is accepting claims of USGI-spec parts actually being done to not only blueprint dimensions, but also made from the correct materials treated to the same processes. So I'm thinking I ought to have M4 ramps in the gun because based on what I've read: Rifle receiver+M4 barrel = "OK" but not ideal. You CAN modify a rifle/A2 barrel extension to an M4 style extension, but it isn't always the best way to go unless you just have to do it. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces Was sort of worried about how it would run with an 11.5" barrel and mismatched ramps, but it sounds like it should be good to go either way. *Must have a registered ARFCOM account to win. You can always buy a non-m4 extension and have the new barrel retimed and headspaced, but it will probably cost more than a new upper receiver. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. 's blog. M4 feed ramps. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. So there's a lot more going on with rounds bouncing up and down in the mags etc. We're a little past that point as I already own both the barrel and receiver, both of which cant easily be replaced or swapped for a decent price. In most cases the ramps only help during full auto mode while cycling at a high rate. If this is your first visit, be sure to I will check with compass lake. He had more to say and added some more engineer and gun designer speak too. I picked up a side charging upper from Sundevil last year. Upper Receiver, A4, Flat Top, USGI, Numbered, AR-Stoner Upper Receiver Stripped AR-15 A3 Flat-Top Matte, Black River Tactical 16 Cold Hammer Forged Optimum Barrel Accuracy Evaluation. Either way is good and both types work great with semi auto only guns. First of Im not a gunsmith or firearms professional. Being a Newbie AR owner ((Ive been an avid gun owner for nearly 50 years), I appreciate the information and visual aids that Im sure will be a big help in enjoying and using this gun platform. Another reason is that any commercial receiver and parts makers want to tool up to make upper receivers and barrel extensions, especially when shorter guns are becoming more popular. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. Proper maintenance and lubrication. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. Finding the proper upper receiver is your best option. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . The barrel extension and the receiver both have to have the cuts. Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. Earlfillmore 13 hr. If I have a rifle ramp upper and get the barrel later and coincidentally will have an m4 ramp. The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. For this test, I used a Colt upper with M4 feed ramps and a SOCOM heavy 14.5 barrel, just like what is used in the military. In case My barrel is rifle ramp it won't be so bad after all. Display as a link instead, Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. I think my question would be why rifle receiver+M4 barrel is just "ok" rather than "good", unless the point is that in a carbine-gas gun M4 ramps are just considered an improvement over no ramps. Full M4 feed ramps start on the upper and continue onto the barrel extension. M4 feed ramps were created during the development of the xM4 carbine for the original Army requirement of a carbine rifle that used the then current M16A2 upper receiver, 14.5" Barrel and had featured a collapsible sliding stock. I can assure you that most mods that deviate from the original design aren't 100% reliable. All comments are held for moderation and will appear after approval. Just put it in and shoot it. M16's fed pretty well before the M4 feed ramps were introduced. what I fear the most is having an m4 ramp upper and then getting a barrel with a rifle ramp. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps You can post now and register later. Press question mark to learn the rest of the keyboard shortcuts. Caught a deal on a matched barrel and bolt. so im thinking I might as well just get the unramp upper. Damaged Ak front end Barrel in Trunnion with or without sight bases. Additionally, in this increasingly specialized world of AR-15 parts that we live in, there are proprietary feed ramp cuts used for some alternate cartridges, such as .458 SOCOM. Went back to the sellers website and found I was not the only one with problems. By using the M4 feed ramps for your firearm, you could pick up an increased percentage of the rounds, and feeding reliability would be improved. FWIW one of my rifles has M4 feed ramps on the barrel and no M4 feed ramps on the upper and it has functioned just fine. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About It's going to a gunsmith to be shortened and rethreaded anyways, can they just grind/polish the feed ramps to match or is it more involved than that? from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. If I was concerned with precision, I would seek out parts from well-known gun makers and customizers Baer comes to mind, Hart barrels, etc etc. A shorter gas tube means reduced gas pressure, and we all know what happens when there isn't enough pressure to cycle the bolt carrier group properly. Most work performed while-you-wait, evening and saturday appointments available. Again, youll find plenty of videos on spooling up hand grinders to remedy feed ramp and ejection port issues with these larger cartridges, but I strongly suggest going factory-done aftermarket. An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. Good call. Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. The best case is to have both an upper and barrel that have the feed ramps. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? For a better experience, please enable JavaScript in your browser before proceeding. In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past. The Mission of Cheaper Than Dirt! If you have an account, sign in now to post with your account. Instead, I just loaded up each mag with two rounds, and pushed the rounds forward by hand until the tip of . If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. Thanks! For those who have actually done it will a new barrel with the M4 feed ramp extension function properly with an old school rifle-type upper receiver? I didnt think anything about it having M4 feed ramps. Metal cases ammunition such as Wolf through an M4 clone? On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. Create an account to follow your favorite communities and start taking part in conversations. What is an m4 feed ramp? I guess it depends on what your relationship to the necessary shop activities is. can you buy feed ramps individually? Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. There's a 7 degree difference between standard and M4 ramps. Its a miracle! If you want precision, dont look to the mil-spec gun, look to the one that is popular in 3-gun competitions, at Thunder Ranch, etc. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. Ok, So, in short, I've got a barrel on my Armalite upper (with M4 feed ramps in the upper) that has standard AR-15 (non-M4) ramps. If you ever have an issue, then look at getting a correct barrel for the upper. I'm planning on replacing my forearm with a Larue 13.5. However, they do have M4 feed-ramps which is not clone correct. I prefer them. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. This can lead to a rare but odd situation; barrel and receiver mismatch. FN AR-15 5.56X45mm Nato . The first reason is that they are, indeed, better. Only took a few minutes. Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . The M4 cut extends down beyond the edge of the barrel extension (has a scalloped appearance), and a correspondingly deeper cut in an M4-spec upper receiver effectively extends the ramps downward (theyre lowered). All we do is dremmel it to match - we dont remove it and grind to any specific angle. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. M4 barrel to non M4 receiver is fine, but not the other way around. Looking For Bear Creek Arsenal Barrels Review? The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. Also, barrel life is relative. The ramps on the regular rifle-type extension are cut just to the edge of the extension. I'd rather not spent the money to get it cut to the specific length I need, FSB installed, etc just to have it immediately not work and have to sort out then or start from square one with a new barrel. . This has been my concern with modifying the aluminum parts. I'll probably build a pistol out of this one. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel. well.. it's kinda hard to get stuff in this part of the world. I think your mistaking that with adding ramps to the receiver. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. A couple of times I ended up with the OK set up from the picture above. 3. Some, me included, have said that the M4 ramps are a help to some of the larger-diameter cartridges in use, such as 6.5 Grendel or .22 Nosler. An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. It was in the last few issues of SAR. Man, its crazy how many of yall have absolutely no idea why you do what you do. A closer look at uppers and barrel extensions. Notice how the ramp starts on the barrel extension and not in the receiver. The mil actually only specs M4 feed ramps for use in its M4s. Check often for fit. FFL Fax: 866-721-8691. Jams and misfires. The reason I decided to write about this topic at all was because there are some mil-spec features advertised on aftermarket parts that arent even really mil-spec. Press J to jump to the feed. #2. Guess what? All things being equal and having used both weapons extensively, Id rather have the feed Ramps. Full M4 feed ramps are on both the upper and barrel extension. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. You also repeated yourself. It is removeable with a special wrench and a barrel clamp/vise. Anodized red parts. There is a picture of the various options, hopefully another poster can link them. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. if you are OK with 3MOA, you might go 20,000 rounds! I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. The last is using the best and right ammo for the job. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. What's the difference? Issues can arise when receivers and barrel extensions are mismatched. Just because you can, doesn't mean you should. Edited April 27, 2014 by Mark Gale I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. Avoid Polishing Too Lightly Or Too Roughly I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. The information provided here does not represent the views of Cheaper Than Dirt! I read in Bravo company that there are 2 kinds of flat top upper. I don't quite trust myself to give it a go, but if that's all there is to it I'm hoping they can do it for a reasonable price. I cant advise on that one folks. I have looked and looked and looked. I checked what I have now. My alternative plan is to do exactly as you describe. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. These units actually feature the NON-F-Marked (correct) front sight base. Theres a bit more to it than just polishing. Ideally both. Feeds flawlessly. Brevity matters. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Modern Series Barrels. I've shot a good deal of rounds through 20" A2's and I realize they run but you are describing issues that the M4 feed ramps alleviate, that would probably be good to reduce on A2's as well. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. Do you have an AR barrel or feed ramp tip? I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 barrel extension. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. Feed ramps being m4 or. A4 Complete Upper Receiver. and add them to non-m4 barrels.? Not all mil-spec features advertised on the product information are the real mil-specs. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) "C" stamp and CAGE code available. While this gun is a more of novelty build than a "serious use" AR, I intend to use good parts and want it to run as well as my other ARs. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. BrianEnos.com Reach in through the ejection port and slide the on deck cartridge about 1/4 inch forward and observe the tip of the bullet in relationship to the barrel extension. Notify me of follow-up comments by email. And that is the important thing! Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. FN AR15 barrels are hammer forged using the same proprietary high-grade Chrome Moly Vanadium steel used in FN's venerable machinegun barrels produced to handle the punishment of . They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. Sent back again. Personally, I would sell the rifle upper and buy an M4 upper - the cost will be small and you will end up with a more satisfactory end product. On the other hand, I wouldn't consider them as a deal breaker, and they would not pass up a good deal with an upper only because it did not have them - the M4 feed ramps. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. 16" Pre-Ban M4 Profile Barrel Assembly CARBINE Gas System About Upper assembly comes completely head spaced and test fired. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. Since the M4 barrel is one and a half inches shorter than the minimum legal barrel you can install in an AR15, the M4 gas tube will be, of course, smaller. All uppers are assembled cleaned and tested before shipping. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. Regular feed ramps are cuts into the barrel extension only, which allows guiding the round into the chamber during loading, making them a fundamental feature of many breech-loading firearm designs. M4A1s run at 950 rounds per minute in full auto and even 950+ rounds per minute as the gas port erodes open bigger and bigger with wear and allows them to run even faster and much more violent. True, which is why they're not even needed in semi autos. I can probably get the upper reciever first. AR9 - Help diagnosing feeding issue. Having been in military supply, I know that what the mil-spec means: it gets the minimum job done for thousands (millions) of parts/systems. You absolutely do not want it the other way around however. Some argue that, factually, its a step to enable a smoother feeding. 2. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. If it was some flat top + 16" FSB barrel id just swap upper/barrel, but this is a little more challenging to do that with. Now, theres nothing wrong at all with a little polish on any and all feed ramps, which can not only be done fairly easily, it can be successfully done by most at home. Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. Either way is good and both types work great with semi auto only guns. However, an M4 barrel extension is dished more so the feed ramps could extend downward, and then an area within the upper is shaped to match. Your email address will not be published. So, an M4 feed ramp includes the barrel extension and the upper. Barrel, sight and trigger work on most pistols and shotguns. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. No feed ramps. Featuring hand lapped 1/8 twist rate button rifling and M4 feed ramps barrel extensions, the 410 stainless barrel gives the shooter the best balance of weight and accuracy. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. You cannot paste images directly. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. They guide the bullet up and into the chamber. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. pictures would help. It is milled out of 6061 T6. Its also recommended you polish the ramps once youve achieved the appropriate angle. Semi autos run slower than full autos. All Rights Reserved. The barrel is supposed to have the M4 feed ramps. can the barrel extension be bought individualy? There are several, but Steve and the guys at ADCO in OH are one such option (they use the Dremel method, but they do it right as I have seen several first-hand examples of their work and its performance after the fact). Should not be too hard. LanceRiley, BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. If you don't clean it but demand 3/4MOA you might get 1,500. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. I built the upper using a Mega upper with a Compass Lake 18" barrel. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. Copyright 1996-2023 AR15.COM LLC. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. I too built a .458 SOCOM carbine . This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. With the bcg moving that much faster, the magazine springs were having a hard time supplying the rounds fast enough, AS WELL AS the tips of the rounds were digging into the feed ramps and catching. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. It's best to use rifle/rifle combo or M4/M4. However Ive built numerous ar15 and lr308 rifles and pistols. A forum community dedicated to drag racing drivers and enthusiasts. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. Does anyone have a follow up that confirms or denies my claim? Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. For use by barrel manufacturers. - The Shooter's Log, 2012 SHOT Show Special Report: Daniel Defense DDM4 V5 in .300 Blackout and a Factory SBR - The Shooter's Log, 2012 SHOT Show Special Report: SOG Armory Predator Rifle - The Shooter's Log, Surefire's 100-Round MAG5-100: The Highest Capacity AR-15 Magazine - The Shooter's Log, Throwback Thursday: Taurus Judge Range Report, ATI Milsport SGA 410 All the Advantages of an AR in .410, Ruger SR1911 LW Commander The Lightweight .45 ACP, Rifle Hack: Sighting for 100 Yards at a Distance of 25 Yards, Throwback Thursday: All About Bullet Grain. So I'm working on my first build, and I'm a little confused. One new winner* is announced every week! The manufacturer said they had sold hundreds of barrels with out problems reported. Gas block area is .750 diameter. $101.95. UPPER RECEIVER: AR-15 Mil-Spec Machined out of 7075-T6 Forged Aluminum, M4 Feed Ramps, Cerakoted Magpul Flat Dark Earth (FDE) Color with Forward Assist and Ejection Port Cover Installed BARREL: 22 inch, 223 Wylde Caliber, 4150 CMV, 1:7 Twist, Heavy Bull Barrel Profile, Straight Fluted, Melonite/Nitride Finish - made for us by Tactical Kinetics HAND M4 Feed ramps on barrel extensions are a solid example. The parts are interchangeable. "A Bad Day At The Range Is Better Than A Great Day Working". Any use of this content without express written consent is prohibited. It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. They are better! Any body need a anchor for a very small boat? Dec 17, 2020. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. When you need to nail something you use a hammer not a wrench. First, the M4 barrel and non-M4 upper isnt likely to cause issues, but due to the relief cut on an M4-spec upper, there will be a gap that works like an edge that most definitely can snag the bullet and stub the round. M4 can better explain their benefit, although they help with more reliable feeding. If your magazines are set up correctly, and the feed lip edges polished smooth, each round fed from the magazine will go directly into the chamber. So, an M4 feed ramp includes the barrel extension and the upper. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 2. M4 Feed ramps on barrel extensions are a solid example. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? The ramps are in the barrel extension. By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. Thanks. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. Go slow and you'll be done in no time. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. The M4 Style Feed ramps And Barrel Extension Provide Consistent Feeding And The Matte Black Manganese Phosphate Finish resists External Corrosion And OxidationLength: 14.70"Model: AR-15Finish: Manganese PhosphateBarrel Type: Carbine LengthBarrel Features: Chrome-LinedManufacturer: FN Mfg Number: 20-100405Model: AR-15 . SKU: BCM-URG-M4-16 Features: M4 Feed Ramp Barrel Extension Caliber: 5.56 NATO Barrel Length: 16in Barrel Style: Standard Handguard: None BCM M4 Handguards (Double Heat Shield) - Black + $15.00 PKMR (Polymer KeyMod Rail) Carbine Length - Black + $24.95 PKMR (Polymer KeyMod Rail) Carbine Length - Flat Dark Earth + $24.95 Stock Status: Out of stock
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