Griffin Armament Stock Mount Kit. All these parts will complete the back end of your lower receiver. This kit is applicable to AR15 family firearms and is compatible with Mil-Spec dimensioned butt-stocks. Specifications for Griffin Armament Griffin Stock Mounting Kit: Manufacturer: Griffin Armament Gun Model: AR-15 Condition: New Package Contents: Griffin Armament Griffin Stock Mounting Kit What firearm models does the manufacturer say Griffin Armament Griffin Stock Mounting Kit is compatible with? The manufacturer says that Griffin Armament Griffin Stock Mounting Kit is compatible with AR-15Griffin Armament GASMK15: Stock Mount Kit