Heat-Treated Castle Nut
Castle nut upgrade for AR15 / M4
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.
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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.
Platform: AR10, AR15, M4, M16, M110, SR25