Colt Pocket Navy 36 Caliber Percussion barrel. I believe this is a real colt part like a second generation or something. The pictures of the trigger guard and cylinder are for references of the markings. I never had the cylinder mount for it but looking at pics online this seems right... If there is anything else I can do to help i.d. it let me know. Barrel is decent shows a little wear and tear. Not rusty at all. Nice bore