Welcome to the board and thanks for sharing your work! The only thing I'd say in the way of a comment, would involve the patchbox. I'm thinking it might be a little more effective if it was slimmed down quit a bit towards the front, like a ramp, and had a more pronounced taper to the sides. You did a really nice job with the fit of the brass end into the butt piece. Nice gun, and I hope to see more of your work in the future.
Ed