First of all thanks for the replies, as I said before I'm new to multigun competition, actually I haven't competed yet. I ask the question because I saw a video of guy showing proper standing shooting stance for an Ar15 using bone support and he says his rifle weights like 16-17 pounds. Then I wondered, where does a gun like that would fall in terms of 3 gun divisions. Didnt know there were pre-fab lead weights for ar15 buttstock and handguards but found 2 websites that sell them.