Excellent Trade Gun, Robert. I've built several locks from 'The Rifle Shoppe'. I've also built 2 from 'Upper Missouri Trading Co' and several from 'Chris Hursch - Antique Gun Parts/Castings.' Production locks have gotten too expensive for me. For less than half the price of a production lock, $100.00 to $150.00, these locks are excellent for building a historically accurate gun. They're not as difficult to assemble as one might think. UMMMM, except the wheel lock. I put one of those together for a guy. That was difficult.