Magpul Enhanced Mil-Spec Receiver Extension - AR15/M4, RET, Black,
Magpul Enhanced Mil-Spec Receiver Extension - AR15/M4, RET, Black,, Constructed of impact-extruded 7075-T6 aluminum with Type III, Class 2 hard coat anodizing for an extremely hard, abrasion resistant surface. The interior of the receiver extension features Everlube(R) coating for enhanced corrosion resistance and reduced friction and wear. The additional position holes allow for more length-of-pull fitment options while retaining a standard length for the tube.