Your rifle looks great Waksupi. You have gone to a lot of work with some fine detailing. Did you use a heat treating oven to get the fire blue so evenly?
I worked with E.G. Smith for seven years. He is a master blacksmith, and taught me quite a bit in that time. The fire blueing was done with an oxy-act torch. I was lucky on this one, and didn't have to polish back to re-do any parts. Some times ya win, and some times ya loose on this. Same thing can be done with niter, and I was going to do it that way, but didn't have a container that would have been large enough to immerse the butt plate, or trigger guard. It can also be done in a lead pot.