This is a replacement frame cam for broken or cracked frame cams. The frame cam is the piece that the bottom of the barrel rides on during lock/unlock and sometimes can break.
This part requires professional gunsmith installation!!
Cylinder and Slide has installed frame cams for years, installation is $ 262.50, and refinishing may require additional cost. Please call ahead and please don't just send your pistol in, as we are booked ahead and are quite backlogged