Sons of Liberty Gun Works AR-15/M4 Buffer Tube Kit Black. Their small parts fit most mil-spec firearms. Specifications for Sons of Liberty Gun Works AR-15/M4 Buffer Tube Kit: Manufacturer: Sons of Liberty Gun Works Color: Black Finish: Matte Gun Make: AR Platform Gun Model: M4 AR-15 Additional Features: 10-Position Features of Sons of Liberty Gun Works AR-15/M4 Buffer Tube Kit: 10-Position Buffer Tube Package Contents: Sons of Liberty Gun Works AR-15/M4 Buffer Tube Kit What firearm models does the manufacturer say Sons of Liberty Gun Works AR-15/M4 Buffer Tube Kit is compatible with? The manufacturer suggests that Sons of Liberty Gun Works AR-15/M4 Buffer Tube Kit is compatible with AR-15 M4Sons of Liberty Gun Works SOLGW-INT10POS-KIT: AR-15/M4 Buffer Tube Kit Black