Image 1 of 2 Image 2 of 2 UTG STANDARD AR15 STEEL BARREL NUT, BLACK PHOSPHATE FINISH $6.97 • Durable Steel Construction with a Matte Black Phosphate Finish• Compatible with Standard Mil-Spec AR15 Upper Receiver Quantity: Add To Cart Added! • Durable Steel Construction with a Matte Black Phosphate Finish• Compatible with Standard Mil-Spec AR15 Upper Receiver Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More