Brother U.S.M.C. I have Rock River products in 5.56 coyote model and Standard Operator in .308/7.62 Operator has almost 500 rounds of factory and mil surplus 0 FTF 0 FTE options are ambi-safety,winter guard,and operator stock.Comes with factory ambi-mag release, ambi-bolt release,flip front and 2 stage trigger.Uses FN-FAL mags there are proprietary parts in upper receiver.My 5.56 has 3k rounds with 0 FTF 0 FTE.Pete @ Legal Transfers had best price on .308@$1350.00 w/4 mo.wait.Shoot on bro. 8)