Looks like really good workmanship throughout. Especially good choice of furniture given a single trigger. Three things I would be critical of and I mean this in a most constructive manner because there's a lot of talent here.
More drop to the butt stock.
Patch box lid is too wide, (Nice work and hinge) and the box is short and should extend almost to the wrist. I just want to stretch it.
Unless the project is deeply antiqued, don't brown the lock. It was virtually never done. And keep the finish consistent. Don't do one thing to the lock in general and then polish the frizzen spring.
