Ok, guys, I have asked a few questions about the info my work partner has said about his m16 when he was in the army during the 1st desert storm involving Kuwait. He says his m16 had only one rifling groove in the barrel. This is the same guy who said his barrel was bent and that the barrels were so worn that the bullet actually bounced on the sides of his barrel. So, I can't seem to find any info about the rifling in the barrels in that time frame. I can't wait to hear feed back about THIS! :-) This gets to be a little fun to be able to quiet him down when I get the REAL answers from you guys!