Interesting.

I've had luck running a carbine receiver extension + a 308 buffer and spring. Then again my sample size with a 308 is much smaller than with my AR15 collection. I think I have like a total of 6 AR10's.

I haven't shot a Rainier Barrel suppressed though, only suppressed setup I'm running is with an old Mega stamped 308 16" Barrel. I'll have to throw a can on one of my Rainier 308 barrels and see what it does.