SPF I am selling this due to changing my mind about my build, I thought I would enjoy it but I found I would rather go SBR, that being said here it is: 16" 5.56 chamber, chrome moly vanadium melonite coated, with 1/8 twist, setup for mid gas. barrel will come with low profile .750 steel gas block and mid length gas tube. I put less then 20rds through it while zeroing my scope. looking to get $175 for the barrel, gas block, and tube, or I would be willing to trade straight across for a 7.5"-10.5" 5.56 chamber barrel with same (doesn't have to have melonite coating). this is the only trade I am interested in, thanks.