My guess is no, otherwise there'd be more scrutiny on the matter of proper size for ideal velocity + proper function + ammo type accommodation.
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My guess is no, otherwise there'd be more scrutiny on the matter of proper size for ideal velocity + proper function + ammo type accommodation.
Buddy of mine bought a Bushmaster Carbine. I staked the RE and the carrier key then upgraded his extractor with a Bravo Company kit and put in a H3 buffer for shitz and grins.
It will run limp-wristed with the weakest ammo I shoot running the H3 buffer.
His A1 windage adjustment drum would not move till I dissassembled it and cut a couple of coils off the spring. It was coil-bound.
This thread remind me to remove my buffer and put his standard buffer back in. He can buy his own H3 buffer.
It does run 80% as sweet with a H3 buffer as my rifles that use the MGI buffers. It made a huge difference in controlability.
Last edited by Heavy Metal; 07-17-09 at 22:35.
My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.
Having recently completed an extended R&D session on a similar problem, my results may be off interest. By comparing the rpm of the rifle from full magazine to empty magazine, lock back and load etc, it became apparent that the problem on this particular setup only occurred when 725 rpm was exceeded, and persisted up to over 1000 rpm. The firing speed varied by as much as 75 rpm during a full magazine firing in 5 round bursts. Below 700 rpm either H1 or H2 (which slowed the firing speed by around 30 rpm) worked well, however beyond a certain gas flow, the weight of buffer became irrelevant, as I could achieve 1000 + rpm with a heavy 9mm buffer and an oversize gas port. I was using a Countashot unit in developement guise, but if you dont have access to one then a normal shot timer might be able to give you the rpm of your carbine, and see if you agree with my findings.
Last edited by GUNNERMOD1; 07-31-09 at 14:02.
The buffer is not just a weight, the 9mm and H3 buffers while close in weight do not function the same.
Could you elaborate on this? One of the other resident "Colt fanboys" as we are called over on arf spoke to an engineer at Colt a while back and one of the questions he asked was about buffers. He was told NOT to use 9mm buffers in 5.56 carbines, but couldn't remember why. I guess this is why, but could you explain it? Thanks.
ETA - What I have gathered is perhaps the 9mm buffer does not have three weights in it that move?
Last edited by .45fmjoe; 08-01-09 at 00:09.
I am aware that a buffer does hold a higher position in life than a 'weight', I mentioned the 9mm buffer only as that was the fastest at 1008 rpm whilst the H3 only made 996 rpm with the same and largest port size used. Despite its different construction, in this test it was neither more or less prone to light strike associated carrier bounce. The firing sequence contains so many variable tolerance components that only by checking the hammer release point to the carrier / barrel extension by using timing guages can the beginning of a tech solution rather than trial and error be found.
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