The AR-15 Pistol Buffer Tube Complete Assembly (PBT-CA) from Phase 5 features an enhanced buffer spring. The lower slot is machined to accept all mil-spec end plates and sling mounts. The Phase 5 PBT-CA is compatible with the Sig Sauer Pistol Stabilizing Brace and provides a snug fit to insure no unwanted brace movement during pistol operation. Specifications for Phase 5 Weapon Systems Inc AR-15 Pistol Buffer Tube Complete Assembly: Manufacturer: Phase 5 Weapon Systems Inc Color: Black Finish: Anodized Fabric/Material: Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Pistol Length: 7.4 in Condition: New Weight: 4.8 oz Features of Phase 5 Weapon Systems Inc AR-15 Pistol Buffer Tube Complete Assembly PBT-CA: Overall diameter: 1.25 inches CNC-machined 7075 T651 certified billet aluminum pistol buffer 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. Machined lower slot offers maximum compatibility by accepting all Mil-Spec end plates and sling mounting accessories. Includes Castle Nut End Plate and Foam Pad. Package Contents: Phase 5 Weapon Systems Inc AR-15 Pistol Buffer Tube Complete Assembly PBT-CA Castle Nut End Plate Foam Pad Carbine Buffer and Phase 5 Enhanced Buffer Spring The Phase 5 Tactical AR-15 Pistol Buffer Tube Complete Assembly PBT-CA is a quality addition to the Phase 5 Weapon Systems Inc lineup. For more great deals on AR15 Buffer Tubes by Phase 5 Weapon Systems Inc, please browse our Phase 5 Tactical Gun Parts page.