I have a 762-SD that I've been running on a LAR-8 308 and was wondering if anyone has heard of an overgassing issue with the Rock Rivers when supressed. I've shot about 80 rounds suppressed through the RR and ended up with a broken bolt catch. I talked with RR and they believe that the suppressor may be causing an over-gas condition slamming the bolt back harder and breaking the bolt catch. Not too sure that I buy that since the travel from a stopped position at the end of it's travel to the bolt catch is minimal with no real time for inertia to build up and cause a whole lot of damage.
Any thoughts on softening the suppressed force just a bit? Maybe a buffer pad? I wish Noveske would come out with a 308 Switchblock........
two different issues-
1. Rock River's gas port is probably onthe large side to function with weaker commercial ammo.
2. Adding a suppressor can overgas such a system, but the effects of this would be greater recoil, gas in your face, failure to strip rounds from the mag... if it's going to cause parts breakage, it would most likely be a bolt lug. i agree that the bolt catch should be reasonably safe.
I have not looked into the options for an adjustable 308 gas block... A switchblock would be perfect. anyone else, ideas?