[ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. Home Firearms Figuring Out Feed Ramps. Single Action and Double Action Which One Is Better For You? This 20" BCM barrel is machined from SS410 stainless steel. 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 (they're lowered). AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. In short, if you have a Dremmel you can do it yourself. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. Shopping with us is absolutely safe - you never have to worry about credit card safety when shopping here Share your latest AR build or photos from the range with #RangeDayFriday for a chance to win a new firearm! Notify me of follow-up comments by email. Reddit and its partners use cookies and similar technologies to provide you with a better experience. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. Theres a bit more to it than just polishing. 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. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. I prefer them. 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. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. 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. 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). Powered by Invision Community, M4-style barrel extension with Rifle-type upper. EDIT: Okay, I understand now! I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. What's the difference? Inadequate knowledge about these feed ramps can lead to lots of problems with barrels because they are essential parts to guide the bullet up and into the chamber. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. 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. You need to match up barrels to receivers for optimum performance. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. Remember less is more, little by little. 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. 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. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. The information provided here does not represent the views of Cheaper Than Dirt! 30 cal. For a better experience, please enable JavaScript in your browser before proceeding. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. The barrel Throat is the second most critical component after angles and should be polished with utmost care. Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. Full M4 feed ramps are on both the upper and barrel extension. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. Feels like a silly question now that it makes sense. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. The tip of the cartridge rarely comes into contact with the upper receiver. As suggested, its best to match the upper and barrel extension no worries that way. aaargh.. that's the setup I hate to see. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. All Rights Reserved. I guess it depends on what your relationship to the necessary shop activities is. Here you can see an upper with "rifle" feedramps. Your link has been automatically embedded. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. Press J to jump to the feed. Press J to jump to the feed. 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. I picked up a side charging upper from Sundevil last year. "It will last 5k rounds instead of 4k. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. I am glad to know that I need to look for changes in design and the differences in the A2 and A4 feed ramp / rails. I cant advise on that one folks. 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. can the barrel extension be bought individualy? One new winner* is announced every week! You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. 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. M4 feed ramps will extend the barrel extension and the upper receiver. Sorta. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. Press question mark to learn the rest of the keyboard shortcuts. are all barrels w/ m4 feed ramps?? Proper maintenance and lubrication. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. The best case is to have both an upper and barrel that have the feed ramps. The ramps on the regular rifle-type extension are cut just to the edge of the extension. The Mission of Cheaper Than Dirt! 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. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. 4. 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? A feed ramp is a basic feature of many breech loading cartridge firearm designs. All Rights Reserved. By Use this M4 Barrel extention with M4 feedramps. So, an M4 feed ramp includes the barrel extension and the upper. No need to alter the upper. Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. 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. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. Read Now. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. instead of mil-spec. Mil-spec is good for the masses, and if you want the job done it is a great start. Anodized red parts. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. For use by barrel manufacturers. M4 Feed ramps on barrel extensions are a solid example. A4 Complete Upper Receiver. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. 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 can assure you that most mods that deviate from the original design aren't 100% reliable. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. Related: If you are using a Ar rifle, best green laser sight is good choice for hunting. 3. I'm assuming that you only need the ramps from one or the other. And it appears that the bolt is slamming into the top of the bullet. Go back to writing school. I should have taken my own advice for once. The barrel blanks available are made from 416 Stainless Steel. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. I just need a little guidance on this and I'm having trouble getting good results from Google. Feed ramps being m4 or. Using an upper with M4 feed ramps with a barrel that does not have them will lead to feed problems as it creates a ledge/lip that can catch the bullet tip as it tries to feed. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. They were not intended to be super long range man killers. i have the rifle barrel. . Copyright 1996-2023 AR15.COM LLC. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. Gas block area is .750 diameter. All NFA rules apply. hey bro nice to see you here!!! this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. Insert the barrel and sharpie the cut area, then use the right bit on a dremel. All we do is dremmel it to match - we dont remove it and grind to any specific angle. Required fields are marked *. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! There is a picture of the various options, hopefully another poster can link them. LanceRiley, Only took a few minutes. I'm a machinist in the aerospace industry and lucky enough to have unrestricted access to a really nice machine shop so the modification from rifle to M4 feed ramps is no sweat, I've done it once before a few years back with a .250" carbide cutter in the mill for a friend and it came out looking indistinguishable from a true M4 extension. Questions on how to install your new BA barrel? By Barrel customizations are also available. Does anyone have a follow up that confirms or denies my claim? I use it for hunting dogs only. what I fear the most is having an m4 ramp upper and then getting a barrel with a rifle ramp. The magazine lips cannot move, so with these larger diameter cartridges, the bullet tips down lower about the centerline of the bore (half of the diameter increase to be exact). 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. 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). pictures would help. Barrel Length: 16" Barrel Material: 4150V Chrome Moly Vanadium Steel Barrel Finish: Phosphate Barrel Profile: M4 Chamber: 5.56 NATO Twist Rate: 1 in 7" Extension: M4 Gas System: Carbine-Length Gas Block Type: Low Profile .750" Diameter Upper Receiver: Forged 7075 T6 Aluminum Receiver Style: M4 Flat top with feed ramps Receiver Finish: Hardcoat Anodized Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. If a barrel comes with the feed ramps could I take them off? Experts advise on 31 degrees+30 minus-zip. 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. It was in the last few issues of SAR. Sent back again. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. . 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 Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . Feed ramps on barrel extensions are a good example. 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. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. Clear editor. Jams and misfires. 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. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. All comments are held for moderation and will appear after approval. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. Bear Creek Arsenal Barrels - 6.5 Grendel Type 2 Barrel This Gorilla Machining AR-15 16" heavy Black Nitride 6.5 Grendel barrel has a Carbine length gas system with a 1:8 twist. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. what does it do?? 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. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. Reliability is the main concern for me when I re-barrel this rifle. I suggest you get a rifle receiver. I'm planning on replacing my forearm with a Larue 13.5. Thats true overall and good to keep in mind. I had seen these pix years ago and dismissed the idea of mix and match. The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. They . The extension is the part at the end of the barrel that fits inside the upper. Only took a few minutes. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. The difference between standard feed ramps and M4 ramps is easy to see. You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. 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? Shorter length equates to much higher pressure in the upper receiver. Thank you for answering the question do well. Man, its crazy how many of yall have absolutely no idea why you do what you do. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. It gives a longer ramp that is less steep into the chamber. The M4 was the first (allegedy) carbine length gas system. Is one better than the other? 's blog. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. As they are becoming more and more a standard, and certainly do not do any harm to us. Gun smith said , not head spaced properly. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. Try this little exercise: 1. If it's happening regularly, check the magazines you are using for serviceability. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 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. 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. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. 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. I recently picked up a barrel that I thought had M4 feed ramps, but it doesn't line up with my M4 feed ramp upper. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. Display as a link instead, CARBON-15 Stripped Lower Receiver Paste as plain text instead, Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. Lol. Recommend using a gunsmith this route too if you are not comfortable. There's a 7 degree difference between standard and M4 ramps. A couple of times I ended up with the OK set up from the picture above. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. 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. Edited April 27, 2014 by Mark Gale Get The Best Trigger Pull Gauges To Make Every Shot Count. Description. so im thinking I might as well just get the unramp upper. They guide the bullet up and into the chamber. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. I got my help from this thread, and thank you again to ORD. Semi autos run slower than full autos. Seems M4 is all the rage these days. Its also recommended you polish the ramps once youve achieved the appropriate angle. I'm a machinist in the aerospace industry and lucky enough to have. The upper I want to rebarrel is modified for Service Rifle competition so it's not quite as cheap as buying another $89 upper from Aero. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. I like all my guns to be reliable. 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. True, which is why they're not even needed in semi autos. However, they do have M4 feed-ramps which is not clone correct. However Ive built numerous ar15 and lr308 rifles and pistols. 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. 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. Brevity matters. which is bad combo. If you have a m4 ramped upper but not barrel you can cause problems as there's a lip of steel barrel extension in the way that can cause feeding problems. This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. 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. If I can correct an issue before it's an issue that is preferred. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. Full M4 feed ramps start on the upper and continue onto the barrel extension. Ready to drop onto a complete lower receiver. Moreover, telling someone that an extension can be modified, while not a lie, is nothing more than mental masturbation when your post contains a caveat for having the knowledge and proper tools.