However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. I built the upper using a Mega upper with a Compass Lake 18" barrel. Jams and misfires. can the barrel extension be bought individualy? Then you can get a regular rifle barrel for the upper with no ramps. Brevity matters. The ramps are in the barrel extension. 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. Either way is good and both types work great with semi auto only guns. Site towers are not "F" marked SPECS: Length- 14.5". The Fora platform includes forum software by XenForo. 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. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 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. May 17, 2008 in The Armorer. Create an account to follow your favorite communities and start taking part in conversations. Barrel customizations are also available. Notify me of follow-up comments by email. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. Full M4 feed ramps start on the upper and continue onto the barrel extension. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. 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. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. CARBON-15 Stripped Lower Receiver *Must have a registered ARFCOM account to win. /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. The difference between standard feed ramps and M4 ramps is easy to see. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. Gun smith said , not head spaced properly. 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. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. Forged 7075-T6 aluminum is harder than a bulls balls. Feeds flawlessly. Theres a bit more to it than just polishing. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. Factory said its fine . So there's a lot more going on with rounds bouncing up and down in the mags 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 (they're lowered). We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. 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. In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past. My experience with ARs is all A-1s. Mil-spec is good for the masses, and if you want the job done it is a great start. Do you have an AR barrel or feed ramp tip? The barrel is supposed to have the M4 feed ramps. It's best to have M4 ramps on both the upper and barrel. Clear editor. So the engineers lowered the feed rampa into the receiver. 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). 2. 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. So like ORD says it is entirely 100% possible and plenty of people do it, but I would rather not do any work to this perfect barrel. AR9 - Help diagnosing feeding issue. Only took a few minutes. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. Thats why AR10s- And Scar heavies exist for. Check often for fit. You want them to match. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. The extension is the part at the end of the barrel that fits inside the upper. 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. You must log in or register to reply here. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. Press question mark to learn the rest of the keyboard shortcuts. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. I can still use the combination. Interesting reading. I picked up a side charging upper from Sundevil last year. The barrel blanks available are made from 416 Stainless Steel. This can lead to a rare but odd situation; barrel and receiver mismatch. I've seen uppers with and without anodizing on M4 ramps . it seems to me to be about 50/50 with and without. The barrel extension and the receiver both have to have the cuts. Home Firearms Figuring Out Feed Ramps. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. My alternative plan is to do exactly as you describe. practical_man Gas block area is .750 diameter. 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. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. 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. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. EDIT: Okay, I understand now! There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. You can post now and register later. M16s and M16-A1s run at 750 rounds per minute in full auto. Ready to drop onto a complete lower receiver. Get The Best Trigger Pull Gauges To Make Every Shot Count. I got my help from this thread, and thank you again to ORD. An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). I'll probably build a pistol out of this one. Feed ramps being m4 or. "It will last 5k rounds instead of 4k. 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. 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. 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. Which Model Colt 1911 is For Me? Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. 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. Amazing what happens in a thread over a simple question. are all barrels w/ m4 feed ramps?? You need to match up barrels to receivers for optimum performance. Hasn't misfed yet, through initial break in up through 1k rounds, and that's mag length ammo. Olympic Arms Upper receiver with rear sight assembly and forward assist and dust cover has M4 feed ramps $260 View attachment 1016575 View attachment 1016576 But, as with anything else, this work can go too far. 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. Guess what? 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. 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. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. All Rights Reserved. You will be able to leave a comment after signing in, AR15Armory.com Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. By Can someone recommend or point me in the right direction of a good quality upper receiver for an SPR build that does not have M4 feed ramp cuts in it? I had seen these pix years ago and dismissed the idea of mix and match. I found the article very informative. - 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. Earlfillmore 13 hr. If you ever have an issue, then look at getting a correct barrel for the upper. Notice how the ramp starts on the barrel extension and not in the receiver. Don't forget read more information about it here! What is the difference between Modern, Performance, and Premium Series Barrels? Full M4 feed ramps start on the upper and continue onto the barrel extension. Powered by Invision Community. I checked what I have now. Your previous content has been restored. 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. 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. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. 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. Polishing the edges of the chamber mouth to remove the edges of that chamfer will. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. The mil actually only specs M4 feed ramps for use in its M4s. Its not a big deal but still an important thing to remember and understand. Thats true overall and good to keep in mind. Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. The Mission of Cheaper Than Dirt! One new winner* is announced every week! The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. 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. The first reason is that they are, indeed, better. Sorta. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. This is a big tip, by the way, for pistol-caliber ARs. 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. It gives a longer ramp that is less steep into the chamber. However, they do have M4 feed-ramps which is not clone correct. When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. Man, its crazy how many of yall have absolutely no idea why you do what you do. 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. 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. and add them to non-m4 barrels.? 308 m5 using m4 feed ramps, which I belive are for the smaller round like. 4. Shorter length equates to much higher pressure in the upper receiver. is the m4 feedramp common in barrel extensions? BEFORE YOU GO MODIFYING IT, check your headspace.I have a Gibbz upper in my junk drawer because the upper -- for some reason -- wouldn't allow a perfectly good bolt (as checked by Criterion) to headspace correctly on a Criterion barrel, with the bolt installed in the carrier. Semi autos run slower than full autos. There's a 7 degree difference between standard and M4 ramps. I notice that's a Gibbz (or Gibbz-type) upper. I too built a .458 SOCOM carbine . Please allow 5~10 days for assembly and testing before ship date. 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). Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. M4 feed ramps. By These units actually feature the NON-F-Marked (correct) front sight base. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. 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. Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. M16's fed pretty well before the M4 feed ramps were introduced. The M4 was the first (allegedy) carbine length gas system. "C" stamp and CAGE code available. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. 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. 16" Pre-Ban M4 Profile Barrel Assembly CARBINE Gas System About Upper assembly comes completely head spaced and test fired. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. Your link has been automatically embedded. Damaged Ak front end Barrel in Trunnion with or without sight bases. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. I have looked and looked and looked. M4 M-4 Feed Ramp Jam with 55 gr grain Bullets, Solution, Fix, AR15 AR-15 Stuck Cartridge iowaunemployment 21K views 10 years ago Comparing AR15 barrels -Faxon vs. Bear Creek arsenal-. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. Copyright 2016 - 2023 by AdventureFootstep.com. What's the difference? 3. 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. Went back to the sellers website and found I was not the only one with problems. He had more to say and added some more engineer and gun designer speak too. They were not intended to be super long range man killers. The barrel Throat is the second most critical component after angles and should be polished with utmost care. 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. Press J to jump to the feed. 50 bucks one way or the other on the barrel ain't squat! Not all mil-spec features advertised on the product information are the real mil-specs. 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. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. All comments are held for moderation and will appear after approval. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. So, I had purchased a 458 upper. If you have an account, sign in now to post with your account. 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 . I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. A4 Complete Upper Receiver. You also repeated yourself. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 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 . Feed ramps on barrel extensions are a good example. Remember less is more, little by little. So, lets glide down these lines below to erase your misconceptions about them. 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. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Either way is good and both types work great with semi auto only guns. Does it make a big difference? All Rights Reserved. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. First of Im not a gunsmith or firearms professional. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. 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.
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