Using the ShureFire FA762K, with the SureFire quick detach muzzle brake (211C); also a low profile adjustable gas block. The rifle and ammo work fine. The sound signature with the *can* on is vary comfortable no need for ear protection.
The accuracy of this rifle is not any place near what I am accustom to; yet it is the same with or without the suppressor. The 5 round mag. provided with the rifle has continued failures to feed after the 2nd round, the same problem with a DMPS 5 round mag.
With a 20 round P mag. the rifle seems to function properly.
As for after market refinements, APEX and ERGO seem to be the only compatible.
This rifle is now on the for sale wall at the gunsmith I work with and yes I know I
may seem nuts to others after what I have put into the rifle! But I do not put a rifle in my safe to work when it feels like or give me headache after headache.
Jake