You need to match up barrels to receivers for optimum performance. This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. I got my help from this thread, and thank you again to ORD. I read in Bravo company that there are 2 kinds of flat top upper. Its not a big deal but still an important thing to remember and understand. check out the. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. You can post now and register later. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. I notice that's a Gibbz (or Gibbz-type) upper. 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. 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). 50 bucks one way or the other on the barrel ain't squat! Is one better than the other? 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. 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. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. 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. As suggested, its best to match the upper and barrel extension no worries that way. Went back to the sellers website and found I was not the only one with problems. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. Watch a video about our Modern Series AR barrel: M16s and M16-A1s run at 750 rounds per minute in full auto. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. 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. 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. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! 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? On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. My experience with ARs is all A-1s. 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. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. 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? I picked up a side charging upper from Sundevil last year. If I can correct an issue before it's an issue that is preferred. 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. 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. First of Im not a gunsmith or firearms professional. If you don't clean it but demand 3/4MOA you might get 1,500. M4 barrel to non M4 receiver is fine, but not the other way around. Gun smith said , not head spaced properly. If you ever have an issue, then look at getting a correct barrel for the upper. 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. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. You cannot paste images directly. Barrel, sight and trigger work on most pistols and shotguns. 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? One new winner* is announced every week! Site towers are not "F" marked SPECS: Length- 14.5". . 5. The ramps on the regular rifle-type extension are cut just to the edge of the extension. These units actually feature the NON-F-Marked (correct) front sight base. With a larger diameter case body sitting down in the magazine, the tip of the bullet sits lower in relation to the chamber/bore centerline than with a .223-size round. Reliability is the main concern for me when I re-barrel this rifle. ago KrinkyDink2 9 hr. 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 Home Firearms Figuring Out Feed Ramps. What is the difference between Modern, Performance, and Premium Series Barrels? There is a picture of the various options, hopefully another poster can link them. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . 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. Also, barrel life is relative. This has been my concern with modifying the aluminum parts. 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. Brevity matters. 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. Should not be too hard. Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? "It will last 5k rounds instead of 4k. Please be respectful of others. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. By Previous. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. CARBON-15 Stripped Lower Receiver Sent back again. I was planning on using a Daniel Defense 14.5 pencil barrel, because like the C8 they are CHF, lightweight profile, and .750 at the FSB (And also because quality carbine pencil barrels with .625 gas blocks seem to be in short supplyor else I'd just build a 723 clone.) . The rifle-platform M16s dont use them. They are better! The best case is to have both an upper and barrel that have the feed ramps. Notify me of follow-up comments by email. 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. 1 is a standard and the other for use with m4 feed ramp barrels. from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. I'm planning on replacing my forearm with a Larue 13.5. so im thinking I might as well just get the unramp upper. Finding the proper upper receiver is your best option. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . Would not feed to save its life! 338 and others not the .308 76251 or 6.5 creedmore which o think should have a.30cal feed ramp.? In short, if you have a Dremmel you can do it yourself. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. Remember less is more, little by little. You will be able to leave a comment after signing in, AR15Armory.com 4. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. Amazing what happens in a thread over a simple question. I just need a little guidance on this and I'm having trouble getting good results from Google. 30 cal. Press J to jump to the feed. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? Add 3% to the total cost for credit card purchases. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. So, an M4 feed ramp includes the barrel extension and the upper. 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. Go slow and you'll be done in no time. Theres a bit more to it than just polishing. I can assure you that most mods that deviate from the original design aren't 100% reliable. 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. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. 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. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Dec 17, 2020. Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. The M4 was the first (allegedy) carbine length gas system. You wrote that much to make a point that should have taken about 100 words? You can modify the upper, but bear in mind that the un-anodized aluminum surface will be very soft and prone to wear if your particular bullet hits it frequently. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. Issues can arise when receivers and barrel extensions are mismatched. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. I can probably get the upper reciever first. Earlfillmore 13 hr. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. M4 Feed ramps on barrel extensions are a solid example. The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. 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). The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. This can lead to a rare but odd situation; barrel and receiver mismatch. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. 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. 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. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. 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. Forged 7075-T6 aluminum is harder than a bulls balls. The parts are interchangeable. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. 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. 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. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. I checked what I have now.
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