So, an M4 feed ramp includes the barrel extension and the upper. Little polish. You absolutely do not want it the other way around however. Only took a few minutes. 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. I'm a machinist in the aerospace industry and lucky enough to have. It is removeable with a special wrench and a barrel clamp/vise. pictures would help. practical_man You also repeated yourself. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. 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 . what does it do?? This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. Mil-spec is good for the masses, and if you want the job done it is a great start. pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. 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 best case is to have both an upper and barrel that have the feed ramps. Either way is good and both types work great with semi auto only guns. Given that most of us dont always have perfect access to truly genuine Mil-Spec, mil-standard parts (those actually used in issued fighting tools), were shopping based on a little part trust and a bigger part knowledge. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? Modern Series Barrels. 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. Upload or insert images from URL. 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. However, I have seen more than a few basement gunsmith hackjobs using a dremel, some Jack Daniels/liquid courage, and an unsteady hand that have made a total, unrepairable mess of the job. Amazing what happens in a thread over a simple question. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. #2. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. A feed ramp is a basic feature of many breech loading cartridge firearm designs. All Rights Reserved. The barrel extension and the receiver both have to have the cuts. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. Required fields are marked *. I didnt think anything about it having M4 feed ramps. 3. The ramps on the regular rifle-type extension are cut just to the edge of the extension. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? 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. Full M4 feed ramps start on the upper and continue onto the barrel extension. Backing up a ton: The ramps on regular barrel extension are cut just to the edges, while the M4 feed ramps have deeper cuts in the M4-spec upper receiver. I built the upper using a Mega upper with a Compass Lake 18" barrel. And it appears that the bolt is slamming into the top of the bullet. Either way is good and both types work great with semi auto only guns. Does anyone have a follow up that confirms or denies my claim? . This can lead to a rare but odd situation; barrel and receiver mismatch. Ideally both. If I can correct an issue before it's an issue that is preferred. 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. 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. You have a rifle barrel. 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. Please be respectful of others. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. 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. If you don't clean it but demand 3/4MOA you might get 1,500. The barrel Throat is the second most critical component after angles and should be polished with utmost care. True, which is why they're not even needed in semi autos. They . For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Your link has been automatically embedded. After two months of back and forth, cleaned up the feed ramps. If you ever have an issue, then look at getting a correct barrel for the upper. 4. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Bullets tend to bump, snag, and stub on these guns. It was in the last few issues of SAR. Reliability is the main concern for me when I re-barrel this rifle. The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. I wouldn't be concerned at all with any wear after modifying an upper receiver. Guess what? Not all mil-spec features advertised on the product information are the real mil-specs. 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. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. You can run M4 cut barrels with rifle receivers, but not the other way around as it will create at catch that can hang up the bullets. I had seen these pix years ago and dismissed the idea of mix and match. 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. Copyright 2016 - 2023 by AdventureFootstep.com. Feels like a silly question now that it makes sense. All Rights Reserved. There is a picture of the various options, hopefully another poster can link them. 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. No need to alter the upper. and add them to non-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 My factory JP CTR-02 has the appearance of the bottom right picture in the post above, M4 barrel extension in a rifle receiver, and there is not a mark on the aluminum under the barrel extension. I'll probably build a pistol out of this one. check out the. There's a 7 degree difference between standard and M4 ramps. This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. FN AR-15 5.56X45mm Nato . The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. Caught a deal on a matched barrel and bolt. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. I found the article very informative. Looking For Bear Creek Arsenal Barrels Review? Damaged Ak front end Barrel in Trunnion with or without sight bases. I think your mistaking that with adding ramps to the receiver. I can still use the combination. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. Metal cases ammunition such as Wolf through an M4 clone? I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. It's near impossible to replace the carry handle upper I have these days, and finding a colt chrome lined 20" light weight barrel isn't a walk in the park either. The mil actually only specs M4 feed ramps for use in its M4s. I suggest you get a rifle receiver. I'm planning on replacing my forearm with a Larue 13.5. All Rights Reserved. Shorter length equates to much higher pressure in the upper receiver. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. This is one time it's better to go a little too far than to leave an edge for the . can the barrel extension be bought individualy? 's blog. Full M4 feed ramps start on the upper and continue onto the barrel extension. Is one better than the other? If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. Its fine to use an M4 Barrel with a non-N4 (rifle) upper but if you have the barrel already is much simpler to just buy a M-4 upper and just replace the upper the barrel is harder to build..I have even cut ramps on a rifle upper and it really wasent needed That is before I knew better.Then I guncoted the ramps before I found out about Aluminum Black treatment. *Must have a registered ARFCOM account to win. If this is your first visit, be sure to Here's some info from Randall Rauch aka www.ar15barrels.com, if your barrel extension has M4 ramps you should have an upper receiver also with the ramps. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. M4 Feed ramps on barrel extensions are a solid example. All NFA rules apply. Its a miracle! VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. are all barrels w/ m4 feed ramps?? . Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. 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. So, lets glide down these lines below to erase your misconceptions about them. Then the manufacturer discontinued the barrel. 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. You can post now and register later. Powered by Invision Community. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. He had more to say and added some more engineer and gun designer speak too. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. Paste as plain text instead, M4 feed ramps. 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. The Fora platform includes forum software by XenForo. When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. There's no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20 AR15). Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. No feed ramps. If it's happening regularly, check the magazines you are using for serviceability. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. M4 barrel to non M4 receiver is fine, but not the other way around. The barrel is supposed to have the M4 feed ramps. In short, if you have a Dremmel you can do it yourself. For a better experience, please enable JavaScript in your browser before proceeding. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. Insert the barrel and sharpie the cut area, then use the right bit on a dremel. Your email address will not be published. JavaScript is disabled. Go back to writing school. I read in Bravo company that there are 2 kinds of flat top upper. I should have taken my own advice for once. Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. 30 cal. 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. -The Barrel MUST be removed from the Upper Receiver in order to use this Kit.-Never cut or polish the aluminum M4 Feed Ramps in your upper receiver! It's best to have M4 ramps on both the upper and barrel. 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. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. "It will last 5k rounds instead of 4k. A4 Complete Upper Receiver. I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. 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. The rifle-platform M16s dont use them. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. 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. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! Konza Defender M-LOK 5.56 16" Rifle 1x7 FEATURES: 16" 4150 Nitride 1x7 5.56 Barrel T-Marked Upper with M4 Feed Ramps Steel Micro Gas Block, and Carbine Length Gas Tube 15" 7075 T6 Aluminum Free Float M-LOK Hand Guard A2 Muzzle Break BCG is an M16 Style Nitride QPQ Finish Charging Handle Mil-Spec 6 Position Mil-Spec Diameter Stock It's best to use rifle/rifle combo or M4/M4. 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. Thats true overall and good to keep in mind. However Ive built numerous ar15 and lr308 rifles and pistols. so it is better to have an upper reciever that's designed for non-m4 feed ramps since you can put in standard barrels right? That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. 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. For a better experience, please enable JavaScript in your browser before proceeding. 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. I'm assuming that you only need the ramps from one or the other. 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. M4 can better explain their benefit, although they help with more reliable feeding. In case My barrel is rifle ramp it won't be so bad after all. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. 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. 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 AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. 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 BrianEnos.com 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 . Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). I can probably get the upper reciever first. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. Interesting reading. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. 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? Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. This has been my concern with modifying the aluminum parts. All comments are held for moderation and will appear after approval. 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. If you aren't 110% comfortable with doing the job, and you do not have all the tools and equipment to do it properly, then have a smith do it for you. 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). By So, an M4 feed ramp includes the barrel extension and the upper. Some argue that, factually, its a step to enable a smoother feeding. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. 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). Just because you can, doesn't mean you should. 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. "A Bad Day At The Range Is Better Than A Great Day Working".
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