Birdhunter50 is correct about the screws - besides - steel or iron is period corect while brass isn't in the ML era,a s far as I know.

One other thing about styling - I'd not have not put so much drop into the heel. The heel should be almost a straight line, horizontally with the comb. More drop than that ezxcentuates muzzle rise and slows the second shot while not pointing as well, which is why the English design had straight combs back to the heel. Each to his own, just my opinion.