The bolts are very easy to switch. Often I've taken one off a barrel that locks good and opens easy and put it on a barrel that does not. It usually solves the problem. All that's needed is a punch just smaller than the roll pin retainer and a small hammer. Carefully drive the pin out, leaving the punch in place holding the bolt and spring, grasp the barrel firmly and push the breech end up against the edge of your work bench slightly compressing the bolt spring. Remove the punch and back off with the barrel and the bolt and spring will fall out in your hand. About a 30 second job. SOMETIMES you can do a thorough cleaning and replace the same bolt and spring and solve the problem, but I usually put in a bolt that I know works well with that frame. The barrel end of the equation seems to be a universal fit. I've not ever found one that any bolt and spring would not fit. Just a thought. GOOD SHOOTIN', Walt :grin: