Does anybody know what these two parts are for? I found them at the bottom of my box of spare parts and they were unlabeled. The box they were in was for all the guns that I shoot more rarely and now I can't remember which gun they go to
Possible guns: Ruger 10/22, Remington 870, S&W 686, S&W 642, Ruger mkIII 22/45, Beretta AL391, or CZ 527. The screw happens to thread into the other part, but not sure if its supposed to go together.