Magpul Heat-Treated Castle Nut

Original price was: $14.99.Current price is: $10.49.

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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.

Made in the USA.