Collapsible Receiver Extension Buffer Tube 2 Position (Mil-Spec)|兩段式伸縮托托管 (軍規)
Recoil Spring|覆進簧
Direct Impact Carbine Recoil Buffer|無緩衝式卡賓覆進簧緩衝桿
Fixed Receiver Extension Buffer Tube (A1 Style)|固定托托管 (A1版)
Collapsible Receiver Extension Buffer Tube 5 Position (Mil-Spec)|五段式伸縮托托管 (軍規)
Recoil Spring & Recoil Buffer Assembly|覆進簧及覆進簧緩衝桿總成