Wow. I must say that none of the locks I've purchased from Davis in the past were anything near as bad as that. My favourite 20 bore has that same lock and it was decent right from the start. I polished it up and heat blued it, but nothing more.
It's not as refined as a Chamber's, but it fits the bill for this gun, and sparks wonderfully. I'm really surprised !
Great job on your build BTW. I look forward to seeing more.