They're 1A and 1B.
In the environment i'm in, either one would be highly effective.
This one i can actually hunt with, if i ever decide to go hunting again. I do go up my uncle's place up the mtn's a few times each summer, it's a really handy and light mountain gun.
Hmmm, looks like longer vent-rib barrels are available for it as well. Happy times.
Here's one all dolled up as a slug gun:
