Sons of Liberty Gun Works AR-15 MIL-SPEC 6 Position Buffer Tube

White Label Armory AR-15 Carbine Buffer Tube 6 Position Mil-Spec

MilSpec/GI AR-15 6 Position Carbine Buffer Tube - Black

Battle Arms Development, Inc. 6 Position Buffer Tube, Mil-Spec Tube, Fits AR Rifles, Black AR15RE-MIL-6C

Guntec USA MILSPEC AR15 Buffer Tube Kit 6 Position Aluminum Receiver Extension

Timber Creek AR Buffer Tube, Black - AR BT BL

Luth-AR Fixed Rifle Length Buffer Tube Complete Assembly Fits AR-15 Rifles, with Buffer, Buffer Tube, & Spring, Black BAP-1

Guntec USA AR15 A2 Buffer Tube Kit Aluminum Rifle Length Matte Ar15