I have been searching for a good hog hunting upper. And I have been tossing around a 6.5 or 6.8. Well I realized that they also make a 7.62x39 upper. Anyone have experience with them? Im settled on this caliber because I don't have any rifle in this caliber. And this will be perfect because ammo is cheap, and its a great hog caliber. (And SHTF) Ive searched around for an upper in stock, but of course I cant find one (I didn't really expect too find one for awhile anyways)