CNC-machined 7075 T651 Certified US made billet aluminum buffer tube; Tube is designed to fit Mil-Spec carbine buffer and spring; Hard-anodized Mil-Spec type III black finish; Classic Military anodized finish adds durability and visual appeal that ensures reliability against component wear; Foam pad constructed of ultra-durable nitrile rubber; Mil-Spec end plate and castle nut; Compatible with SB Tactical Braces that accept round tubes; Not compatible with adjustable braces (ie: SBA3, SBA4, PDW)