Smylee - All of the engraving I have done on this gun has been done with four gravers. The three primary ones are all ground from 1/8" square Glenn Steel blanks. One of them is a flat (about 0.050" wide) that I use for all the pick and dot work. Two others are simple 90 degree square gravers. One has the end ground to about 0.050" wide and the other, for shading and finer lines, has the tip ground to about 0.025" wide. The fourth graver is a multiple liner I use for shading things like the cannon barrel on the butt plate. Of course, I have dozens of other gravers that I have made up for one thing or another, but the four I mention here are the only ones I needed for this job.
However.....come to think of it.....I did make a new beading punch to make the little round beads at the breech. I didn't have one the right size, so I made up a new one. Not really a graver, per se, but one of the tools I used on this gun just for the border beading.