| Platform | Mk4 |
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Expected to ship within 15-30 business days. AR Parts Notice - State/local restrictions may apply in CT, DC, IL, MA, NJ, NY, or WA. Customers must review our Shipping Policy prior to ordering.
Nut, Receiver Extension, M4
M4 / AR Castle Nut, Receiver Extension (Buffer Tube) castle nut. Matte black finish.