Mil-Spec AR-15 Carbine Receiver Extension - 6 Position

This M4-style receiver extension tube has six precision-machined notches on the underside for maximum flexibility in setting length-of-pull with adjustable buttstocks, and accommodates Mil-Spec sized stocks. 

Features:

• Impact Extruded
• Mil-Spec diameter buffer tube
• Rolled threads
• Drain hole
• Material: 7075-T6 Aluminum
• Dry Film Lubed Inside Per Mil-Spec
• Finish:  Type III Hardcoat Anodized
• Six adjustment positions