SOLD I've got a 20" heavy barrel ar15 upper up for sale or for trade. It has a 12" YHM free float tube with rails. Front gas block is railed. Does not include flash hider, bcg, or charging handle. I was told it is an older factory YHM upper but I can't be sure. Barrel does not appear to have markings on it but previous owner said it is a 5.56 1/7. Condition is good but clearly used. Just minor scratches and wear. Asking $350 or willing to trade towards stuff like glocks or springfields in 9 or 45, remington 700 in 308, etc. I can add money if need be.