Kaw Valley Precision Pistol Buffer Tube Black. The KVP pistol kit utilizes a standard castle nut and end plate for attachment to a lower receiver. This attachment method does away with the need for a strap wrench. Note: This tube doesnt work with the KAK Blade without modification. Specifications for Kaw Valley Precision Pistol Buffer Tube: Manufacturer: Kaw Valley Precision Color: Black Finish: Anodized Fabric/Material: 6061 Aluminum Package Contents: Kaw Valley Precision Pistol Buffer Tube Kaw Valley Precision KVP-BT-PIS: Pistol Buffer Tube Black