Looking for 6.5 Grendel or 6.8 spc complete uppers w/ BCG. Willing to trade(depending on condition) a .300 Blackout complete upper w/ BCG. 16" Stainless free float barrel w/ matte finish, 1:8 twist & flash hider. Full length Keymod rail and 2 Magazines included. Rifle has less than 8 boxes of...