The Hera Arms fixed HRS stock is one of the most stable polymeric shafts and at the same time lightweight. This easy to install replacement is made from fiberglass reinforced polymer. Also features removable covers that provide additional storage capabilities. The HRS stock is designed to be used with AR15/M4 systems featuring a standard A2 (Rifle) buffertube. The HRS can also be used on systems using a A2 rifle-tube compatible to the AR15/M4 system.