Ar-15 A2 Stock Spacer - Brn Ar-15 A2 Stock Spacer, Aluminum

Armaspec A5 Spacer 0.75" in Black - High-Quality Spacer for A5 Buffer Tube Systems - ARM154-RFL/A5

Armaspec Fixed Stock to Carbine Spacer Black - Reliable Spacer for Converting Fixed Stocks to Carbine Length for Versatile Shooting - ARM154-RFL

Aero Precision Receiver Extension Lock Nut

Aero Precision AR15/AR10 Rifle Buffer Tube 6

Guntec USA AR-15 A2 Rifle Stock Aluminum Tube Kit

Vltor A5 Recoil System Carbine Receiver Extension Buffer Tube 7-Position Mil-Spec Diameter AR-15 Aluminum Black

Spikes Tactical Billet Rifle Stock Spacer to use ST-T buffers in A1/A2 stocks