XCR Forum banner
1 - 1 of 1 Posts

·
Super Moderator
Joined
·
247 Posts
Bummer. My first guess would be as above, gas block screw came loose, allowed the block the move a little, and the harmonics BTFO the dial set screw. Gas block screw should be 100in/lb, do the barrel straightening trick on your other rifle, then witness mark the screw.

The only screws I've had back out were on the ejector. Luckily I just noticed it during a cleaning. Now I torque and mark everything that can turn. I haven't seen the gas block screw come out like that though, that's a first.
 
1 - 1 of 1 Posts
Top