This is a used ready for use as a right hand percussion lock plate for Thompson center. It came from a later Hawken rifle and has very little case color remaining. This lock plate will work for many Thompson Center Side Lock Muzzle Loaders. It is for use with the the built in axle type sear not the screw rotating sear. It will work on most later TC large right handed rifles or Shotguns. This one can easily adapt to your muzzleloader project. Thanks, Danny.