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The Heat-Treated Castle Nut screws onto the AR15/M4 lower receiver extension (buffer tube) and keeps the receiver extension and lower receiver end plate secured in place. The large notches allow for positive engagement with a castle nut wrench for proper installation and torque. The smaller notches provide a location for the end user to stake the castle nut to prevent accidental loosening.
Finished in a Mil-spec manganese phosphate.
The Magpul Enhanced Receiver Extension is a 10-position, Mil-Spec sized, SR25 / M110 profile buffer tube optimized to fit with the full line of Magpul Mil-Spec Carbine Stocks.
Due to its longer length, this receiver extension is compatible with most DPMS® Gen 1 pattern 7.62x51 firearms with standard length AR15 / M4 carbine buffer components as well as aftermarket A5 buffers and springs for use on 5.56x45 AR15 / M4 platforms.*
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® coating for enhanced corrosion resistance and reduced friction and wear. The additional position holes allow for more length-of-pull fitment options.
The Magpul Enhanced Receiver Extension is a 7-position, Mil-Spec sized, AR15 / M4 profile buffer tube optimized to fit with the full line of Magpul Mil-Spec Carbine Stocks.
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® 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.