The Phase 5 Tactical PBT is a quality upgrade designed to improve handling, speed, and consistency when it matters. Built with durable materials and a proven design, it's a smart choice for shooters who want dependable gear without guesswork. CNC machined aluminum buffer tube to fit MIL-Spec carbine buffer and spring. Hard anodized MIL-Spec type III black finish. Machined lower slot to accept all Mil-Spec end plates and sling mounting accessories. Mil-Spec end plate and castle nut. Foam rest padding included.