AR-15 notched crown castle nut in black billet aluminum. It secures the carbine buffer tube and end plate to the lower receiver, with standard notches for both your armorer’s wrench and staking.
Features:
Secures a carbine receiver extension and end plate on a mil-spec lower. Aluminum is softer than steel, so stake the nut after torquing. Confirm your buffer tube uses mil-spec threads.
