A Wolff XP hammer spring helped, but still had an occasional light hit. I noticed the firing pin spring was much stiffer than my Beretta and Bennelli, so I started cutting off coils until it started compressing just before you could insert the rollpin. I haven't had a light strike since.
A warning: this spring prevents the firing pin from touching off a round when the gun is dropped straight down on the muzzle. While most military rifles (AR included) have no spring, and several other shotguns I looked at had minimal spring force on theirs, I make no promise on the safety of the gun after said modification. I slammed the bolt down on my bench afterwards and saw no movement of the firing pin, so its good enough for me, but do ot at your own risk.
