I don't hunt with red dot, or any other electronic sights, although, I might consider a PK-AS, since it has a reticle when the batteries run out. But at distances where the 7.62x39 is most effective, a 3 moa dot should be OK, I guess. I have AKs, (Saigas, actually) that are a more accurate than 3 moa.
Armoredman brings up a good point (he's good at that, isn't he?). There are two things you need to check on - whether you can have a magazine with a capacity greater than 10 - if not, you can always block the mag so it will only take 5 rounds - and whether or not hogs are game animals. In my state, they are not considered game animals, and you can kill them any way you want with anything you want on private land.