What are the differences in the stocks, and why are there different part numbers. lets say you have a

1 Long Action
2 Stagger Feed
3 Blind Mag
4 Top Bolt Release

And you want a Thumbhole with a bull channel Finished, if you put in a 110 instead of a 111 or any other long action number, it comes out to a different part number why would that make a difference? the 4 different spec should make a difference and nothing else. Or am I missing something.

Dean