Some of the good old shot guns used horn/bone, you can stain it .
Would be easer to work than brass, you need sharp files, rasps for
brass. Also you see some hi grade shot guns with no butt plate,
the wood is curved same as a pad and rounded some and then
light checkering, real nice.I am not sure if brass would look right,
What type of shot gun? Any steel place would have brass,
also knive making supplers, also I think I have seen this at
"house of tools".