I just recently purchased a 75rd chinese drum for my Yugo AK, and I am getting addicted to bumpfiring the entire drum . I was advised by my dad not to do it because it might screw up the barrel (it isnt chrome lined) , which I don't want to do because this thing can print nice 3" 100 yard groups with Wolf ammo. I don't do drum after drum, just once per range trip,and I let it cool for 15-20 minutes before I start shooting again. Am I ruining my barrel? My vote was that it's an AK, so it should be able to take it. What do you guys think?