Ok, I was advised that my groups would shrink if I waited a minute or two between shots so that the barrel would cool. This seemed to improve the accuracy on my Centurion 99. I was wondering what barrels out there would group consistently in rapid fire. I figure, if an HK will group 4" in rapid fire and an AK will do the same anyway, maybe an AK would be a good choice? I'd assume that the slower velocity of the Soviet cartridge would heat the barrel less, but what about AKs in 223? Would I have to treat a VEPR II like an AR in order to get the AR accuracy that they boast?