TacFire A2 AR-15/5.56 Complete Stock Kit Polymer Black. The kit includes a rifle length receiver extension tube A2 buffer buffer spring spacer and screw. The hinged butt plate provides access to the internal storage compartment. Made of durable impact resistant polymer. Specifications for TacFire A2 AR-15/5.56 Fixed Stock Kit: Manufacturer: TacFire Color: Black Gun Model: AR-15 Additional Features: 5.56 mm Length: 10.5 in Condition: New Gun Type: Rifle Features of TacFire A2 AR-15/5.56 Fixed Stock Kit Compatible with mil-spec AR-15 lower receivers Color: Black Material: Polymer Length: 10.5in Net Weight: 1 lb 9.6 oz Package Contents: TacFire A2 AR-15/5.56 Fixed Stock Kit Includes rifle length receiver extension tube Incudes A2 buffer Includes buffer spring Includes spacer & screw What firearm models does the manufacturer say TacFire A2 AR-15/5.56 Fixed Stock Kit is compatible with? The manufacturer suggests that TacFire A2 AR-15/5.56 Fixed Stock Kit is compatible with AR-15TacFire MAR123: A2 AR-15/5.56 Complete Stock Kit Polymer Black