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Posted: 4/1/2012 7:12:27 PM EDT
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So I know this has probably been asked a million times, but what buffer do I need to properly run a full auto m16 set up as an M4? Theres so many buffers to choose from....
Specs: colt lower internals, colt bcg, colt socom M4 14.5" upper, and soon to have a AAC M4-2K. |
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You start with a regular carbine buffer, and see if that works, first. ... and that is where I stopped. Mine runs with no issue on a 11" upper and a 16" upper with a standard carbine buffer. With any luck at all, yours should run fine with a carbine buffer. |
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If I have a m16 with 16 inch barrel, carbine length gas system, and a2 stock do I need to run a carbine buffer as well? What if in add a can to the mix? Thanks Actually the very last thing you ever want to do with an A2 full length stock is run any sort of carbine type buffer regardless of the model or weight. All carbine buffers are shorter in length than a full stock buffer and will allow the carrier (specifically the back of the gas key) to impact the 12-o'clock postion on the lower receiver buffer retainer ring....which is just about the fastest way to destroy your lower receiver short of a ammo kaboom. If you are running an A2 stock than run a full length A2 rifle buffer. Technically you can put a delrin spacer into an A2 stock and then run a carbine buffer but there is really no reason to. Most of the special purpose carbine buffers are out there to deal with shorty barrels and reduced dwell times (i.e. distances between chamber - gas port - and end of barrel) which lead to more violent action mechanics and result in high rates of fire, bolt bounce, busted extractors and all the nastiness that comes with sub 14" barrels and reduced buffer tube volume. With a 16 inch barrel you are running a barrel with a muzzle to gas port distance technically greater than a 20" A2 barrel and have the abilty to run a nice big full size rifle buffer with plenty of both static and sliding mechanical weight. A rifle buffer should be able to handle a suppressor on a 16" barrel without issue either although your ROF will increase. If I was running a 14.5 inch upper with a standard carbine stock buffer tube I would personally probably start with an H buffer so that you know you are actually getting the proper sliding weights to act as a deadblow to keep the action closed as Colt intended with the 14.5" barrel M4.. Some of the cheaper plain non H marked "carbine" buffers just have bb's in them and were never intended for full auto, especially supressed full auto. |
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Colt 6921s come with a H buffer. Yea I know those are semi . I'm thinking the M4 comes with a H buffer too. How does one increase the rate of fire? Will I need to swap out for a lighter buffer? or are there other things to do? Easiest way to increase the rof would be to pull the front site base and drill the gas port open a couple wire sizes. That will increase your ROF for the cost of a drill bit. |
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Yes, the rifle spring (there is no "A2-specific" version) is about an inch and a half longer than the carbine spring. Both springs have an allowable variance in lengths. I don't have a reference handy to quote you the different specs.
A rifle spring in a carbine receiver extension can lead to short stroking, because it can keep the carrier from cycling fully. |
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Thanks for the help. I am running a rifle length buffer in my m16 but it seems to run fast. Yep and that right there is why so many of us have gone to the Vltor A5 http://img859.imageshack.us/img859/990/a1upper003.jpg http://img405.imageshack.us/img405/9820/m4003.jpg Not me... You couldn't pay me to put that on my M16. |
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Thanks for the help. I am running a rifle length buffer in my m16 but it seems to run fast. Yep and that right there is why so many of us have gone to the Vltor A5 http://img859.imageshack.us/img859/990/a1upper003.jpg http://img405.imageshack.us/img405/9820/m4003.jpg Not me... You couldn't pay me to put that on my M16. That's OK you don't have to worrie about that happening any time soon anyway. 
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Specs: colt lower internals, colt bcg, colt socom M4 14.5" upper, and soon to have a AAC M4-2K. The "H2" buffer was specifically introduced because of bolt bounce issues with the RO921HB ("M4A1 SOCOM") profile barrel. IMHO - if you're building what's essentially an RO921HB clone (M4A1 - Colt BCG / barrel / internals), why not use the buffer that's designated from the factory and that is being used in many thousands of M4A1s, suppressed and unsuppressed? ~Augee |
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Thanks for the help. I am running a rifle length buffer in my m16 but it seems to run fast. Yep and that right there is why so many of us have gone to the Vltor A5 http://img859.imageshack.us/img859/990/a1upper003.jpg http://img405.imageshack.us/img405/9820/m4003.jpg Not me... You couldn't pay me to put that on my M16. Are you talking about the Stock or the A5 buffer tube system? I use the A5 Buffer Tube system but I put my own Mil-Spec sized stock on mine, so you can put any stock you want on it. The only so called down side would be when it is fully pushed in you gain about 3/4" to 1" OAL compared to a regular car style system. |
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If I have a m16 with 16 inch barrel, carbine length gas system, and a2 stock do I need to run a carbine buffer as well? What if in add a can to the mix? Thanks Here is a video of my son Mike shooting my Colt M16 with his 7.25" POF 416 Upper on it. Stock and buffer are the standard A2 that came with my Colt M16 Model 901. I think we put 700 rounds through it that day without a single problem http://www.youtube.com/watch?v=n5Bg8fkC89U Dane |
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Thanks for the help. I am running a rifle length buffer in my m16 but it seems to run fast. Yep and that right there is why so many of us have gone to the Vltor A5 http://img859.imageshack.us/img859/990/a1upper003.jpg http://img405.imageshack.us/img405/9820/m4003.jpg Not me... You couldn't pay me to put that on my M16. Are you talking about the Stock or the A5 buffer tube system? I use the A5 Buffer Tube system but I put my own Mil-Spec sized stock on mine, so you can put any stock you want on it. The only so called down side would be when it is fully pushed in you gain about 3/4" to 1" OAL compared to a regular car style system. I am not a VLTOR fan. |
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