HM Defense's Avenger M308 rifle features a HM MonoBloc barrel with an integral machined gas block. The 4150 chromoly barrel also features a rifle-length gas system and is match grade, tripled honed, and button rifled. The Avenger M308 also utilizes a 15" free-float handguard with Picatinny rail and is compatible with Magpul M-Lok mounting system. To finish off this tactical firearm is a Mil-Spec HM stock and Magpul MOE grip.