the numbers on the assault rifle display are what im talking about.
I got some bitmaps, and the only number there is 0. im certain the others are there in other channels or something (those arent something im familiar with) but i dont know how to get to them. Could someone at least explain to me where they are and how to access them in gimp?

of course, I could be completely wrong and just be missing the files for the other numbesr.

You've got only one permutation of the bitmap you've made, which is zero. Open up the battle rifle numbers or vanilla assault rifle numbers and you'll see what I mean. They're listed from 0 to 9, so when making them, make sure they have a pixel between the actual bitmaps so when compiling tool knows that they're permutations.