Primary Weapons Systems Castle Nut 7075 T-6 Aluminum Anodized

The Primary Weapons Systems 4G2BTMB-1F Castle Nut is a high-performance, mil-spec upgrade engineered for reliable, smooth operation on rifles, featuring a 7075 T-6 aluminum construction that is impact extruded and finished in Type III, Class 2 anodized black for enduring durability. Weighing 4.3 oz, this lightweight accessory incorporates an extended carrier support lip for enhanced cycling reliability and a precision-cut, fluted tube design that aids debris clearing and reduces weight by approximately 1 oz, helping shooters maintain balance without sacrificing strength. The design also includes lightening cuts to further minimize bulk while preserving rigidity, paired with a smooth pistol buffer tube interface to promote consistent action and reduced felt recoil during rapid fire. The kit comes complete with a PWS ratchet lock castle nut and end plate set, delivering secure, maintenance-friendly installation. With its MIL-A-8625 F, Type III, Class 2 anodized finish and anodized color, the 4G2BTMB-1F combines rugged military-grade quality with practical field performance for precision builds, hobbyist rifles, and competition rigs where dependable cycling and clean, debris-free operation matter most.