AR15, which buffer and spring

[41MB-04TJ]

I am in the process of getting together parts for another build. I already have the Kreiger barrel after waiting a while for that, its an 18 inch heavy profile barrel with a medium muzzle (I don't know the gas hole diameter, and if I did it still wouldn't help me, but I suppose it could be useful information for someone to figure this out). This rifle will be fired almost exclusively with a suppressor (whats the point in zeroing it if you never know what you are going to show up with). I would like to keep the recoil down to spot on my own, and keep the rifle gas under control instead of having it overgassed for the sake of reliability (and breaking a bolt).

I will be shooting only .223 out of this rifle, and only bullets in the higher grain range (1:7.7 twist). It will have a lighter trigger in it (looking at the Jard triggers) to better match my bolt actions so the hammer spring might be lighter too.

I was thinking to just go with the standard rifle buffer, and get a stiffer spring for it. With the .223 (slightly less oomph than the 5.56, but a heavier projectile, this is what is causing me problems). All of the heavier recoil buffers are several times more expensive than the standard rifle buffer, so I was thinking about buying some tungsten and screwing around with te weights inside of one myself, but I don't know how to tell if the bolt is bouncing with out a high speed camera.

THanks.

 

[Viperdoc]

I also have a Krieger varmatch 223 barrel with a 7.7 twist, and tried an Olympic Arms hydraulic buffer. It caused the gun to short stroke on every round, unless the loads were very hot, showing flattened primers, and this was at the lowest setting.

Instead of the buffer, you might consider looking at the BCG- the M-16 BCG, as sold by a few, is substantially heavier and has more metal. In combination with the Carrier Weight System (Sinclair), you can add substantial mass to the BCG, and increase time in battery. This seems to make the gun able to withstand more pressure without the pressure signs. I run an M-16 BCG in a standard upper with a Geissele trigger, and use the tungsten heavier weight as well. The bolt action is visibly slower and the brass only go a few feet away. As stated on another thread, the gun seems to tolerate at least a grain higher than max published loads without any pressure signs like popped, leaking, punctured, or flattened primers. This has been the case with three different Krieger barrels and two different AR's.

 

[41MB-04TJ]

Well good. It sounds like the chatter from some of the .223 shooters at my range is a little exaggerated. Between this and the other thread it seems that a M-16 carrier is all the screwing around that is needed. If you want to sped money then spend it on the Tubb CWS, which is still less than the cost of a heavy buffer.

Thanks.

 

[GaCop]

I'm using an H2 buffer in my midlength gas system 16" and have very good results.

Tom

 

[Doc Bob]

You could try one of these:

http://www.brownells.com/.aspx/pid=7592/Product/AR_15_M16_ADJUSTABLE_GAS_BLOCK