The ATI Outdoors Advanced Technology AR-15 Castle Nut secures the buffer tube to the lower receiver and locks the end plate in place.
- Part Type: Castle Nut
- Compatible Firearms: AR-15 Pattern Rifles
- Material: Steel
- Threading: Mil-Spec
- Installation: Drop-In (Requires Castle Nut Wrench)
- Features: Staking Notches for End Plate
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