remove the buttstock, flip the safety to the off/ready to fire position, take small screwdriver and turn the safety screw in until it stops, replace buttstock, safety is now inoperable and the you use it just like the presafety guns with the hammer at halfcock.
Same procedure I used. Reversible, and the O-ring won't come off. Takes less time than going to the store to get an O-ring, which I kept forgetting about while looking at all the other crap....
