AR-15 Castle Nut Features This steel AR-15 castle nut is virtually indestructible and works with commercial, military, and hybrid buffer tubes. It fits most AR-15s and AR variants, but it is not compatible with 308 rifles. High quality components and precise manufacturing make Advance Tech parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on. AR-15 Castle Nut Specifications Brand: ATI Outdoors Category: Screws & Nuts Model: Castle Nut Firearm Fit: AR-15 Series: Castle Nut Material: Steel Size: Mil-Spec Finish: Black More Information Condition New in Box Finish Per Color Black Manufacturer Advanced Technology Manufacturer Part Number A5101020 Model Castle Nut Type Misc AR Parts UPC 758152900067
