To get past the flinch, stop shooting from a bench until you lick the problem. Perceived recoil is more from the bench than when shooting off hand. Don't think of the lock when you shoot, concentrate on the sights. I teach people by telling them to think and count to their self, "squeeze, 2,3,4", before lowering the rifle. By concentrating on the sights, the flash is much less notable, and helps with overall follow through and accuracy. The more you shoot, the less you see the pan flash. I'm not aware of it at all anymore.