AT3 Tactical AR-15 Mil Spec Buffer Tube Blue. These AR15 Lower Parts by AT3 Tactical are a tough and durable solution for your rifle protecting it from damage without limiting its rate of fire. This enhanced strength and rigidity provides a strong foundation for your firearm keeping it locked and loaded in the field. Every AT3 AR-15 Mil Spec Rifle Buffer Tube is anodized for a matte black finish that will resist corrosion and extend its lifetime of use. Also it has six precision-machined notches which ensure your stock stays securely locked into position. Boost the potential of your weapon by using this AT3 AR-15 Mil Spec AR-15 Buffer Tube. Specifications for AT3 Tactical AR-15 Mil Spec Buffer Tube: Manufacturer: AT3 Tactical Finish: Anodized Fabric/Material: 6061-T6 Aluminum Length: 7.25 in Diameter: 1.146 in Condition: New Features of AT3 Tactical AR-15 Mil Spec Buffer Tube Thread type: 1 3/16-16 UN-3B SPECIAL Package Contents: AT3 Tactical AR-15 Mil Spec Buffer Tube AT3 Tactical BT-01-MILSPEC-BLU: AR-15 Mil Spec Buffer Tube Blue