I guess I should have been a bit more specific. Mine is a BCM 14.5" LW middy. After reading here maybe the H2 isn't such a good idea, at least for dead-nuts reliability across the spectrum.
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A5H2 and the DD V5 Middy system is utterly reliable, smooth, and for the cost potentially unbeatable.
I run an H in one of my 14.5 BCM's and in another BCM 14.5 I run a H2. The second rifle gets a can half the time, but it runs fine still without. I only shoot 5.56 though. I would run Carbine buffers with .223 and un-suppressed. Then you can run any ammo you would like, I would assume.
I have the Vltor A5 system in my 14.5 noveske mid and an H2 buffer in my 16 noveske mid. Both run very well for me.
PSA 16in Middy with a Spikes T2 and Blue Sprinco. Cycles PMC, Independence fine, but doesn't like Tula
14.5" BCM, H buffer and Sprinco White cycles everything even PMC Bronze. Runs smooth with a H2 with nato powered ammo, but failed to lock back with Tula and PMC Bronze. H buffer is the ticket for running a variety of ammo.
We did. And some things people need to keep in mind (and I posted about this in my Tuning the Gun 101 thread) are that there are factors that need to be considered such as the gas port size, type of spring, the carrier and ammunition.
Whatever buffer is being used, you should always ensure that your weapon will work with the lowest powered or weakest ammo you have. Or at least know how your ammo performs so that if needed you can swap the buffer over. It has been my experience that if you use the A5 system, with a green Sprinco spring and the -3 buffer your weapon should work with a wide spectrum of ammo.
The two middies I put together with PSA parts have CAR buffers, and they have been extremely reliable with all ammo used, including steel cased stuff. I have a 20" rifle length that I run a CAR buffer on too, and it has been absolutely great. I see the heavier buffers mostly as a band-aid for an over-gassed rifle or one with too long of a dwell time.