An AR-15 pistol receiver-extension hardware kit, sized to accept a blade or fin stabilizer (sold separately). Supplies every rear-end component needed to complete an AR-15 pistol lower — drop the trigger group in, attach the grip, install this kit, and the build is ready for an upper.

Kit contents:

• Pistol-length receiver extension (approximately 7.3" — accepts a blade / fin / stabilizer)
• Recoil buffer (pistol/carbine weight)
• Buffer spring
• Castle nut
• Receiver end plate

Important: this is the buffer-tube hardware only and does not include a blade, fin, or stabilizing brace. If you want the stabilizer bundled, choose the pistol-blade-and-buffer combination kit instead. Tube is mil-spec diameter (1.148"); commercial stabilizers will not fit. Stake the castle nut after final torque to prevent it from backing off under recoil.