I don't have to take any screws out of my Mark II, just pop the latch and pull the mainspring housing out, then pull the bolt and recoil spring out together to clean it from the breech. If it wasn't tricky putting the mainspring housing back in it would be great. But if I put this part it won't be tricky anymore, so I probably will get it eventually. The guy who owns the property next to my friends' cabin also has a Mark II. I should buy him one too, but probably won't see him until sometime around Memorial Day weekend if he's even there. I should have my friends get hold of him.