To employ our barrel, you eliminate the factory trunnion block (use heat to remove the a few screws) and transfer the bolt keep open pieces to our trunnion. Then assemble into the manufacturing unit receiver.Ruger ~ LCR ~ .38 spl+p GI#: 102722202 Up for sale right now is a gorgeous Ruger LCR chambered in 38spl+p. This incredible firearm is a superb