Every 4 boxes or so the left barrel of my Rigby 16 g SLE will fire if I barely touch the trigger and I am trying to determine whether it is the lock itself or if opening and closing the action just isn't resetting the lock all the way on the sear.

It happens with both factory RST and my reloads.

Any thoughts (other than the "send it to the gunsmith"?

Thanks

I have become addicted to English hammered shotguns to the detriment of my wallet.