This AR-10 complete 22-250 rifle length upper has a 20" 416R stainless steel light-weight barrel, and features a 1:14 twist rate, with a rifle length gas system. It includes a 15" MLOK split rail handguard, an M4 flat-top forged upper receiver, a AR10 bolt carrier group, a flash hider, and a rear charging handle. This is compatible with a 1st gen DPMS low profile AR10 lower assembly.