HM Defense's Defender M5 rifle features a HM MonoBloc 4150 chromoly, match grade barrel with an integral machined gas block and is tripled honed and button rifled. The Defender M5 utilizes a 15" free-float 1913 Picatinny rail and is compatible with Magpul M-Lok mounting system. To finish off this tactical firearm is a Mil-Spec HM stock and enhanced grip.