UTG Pro AR Pistol Receiver Extension Tube Kit Matte Black. UTG PRO made in specialized factories AR Pistol Receiver Extension Tube Kit Includes a Precision Machined Matte Black Type III Class II Hard Coat Anodized 7075-T6 Aluminum Extension Tube Featuring a Dry Film Lube Coated Interior Complete with Carbine Buffer Buffer Spring Castle Nut and QD Receiver End Plate Specifications for UTG Pro AR Pistol Receiver Extension Tube Kit: Manufacturer: UTG Pro Color: Matte Black Finish: Matte Fabric/Material: Aircraft Grade Aluminum Gun Make: AR Platform Condition: New Country of Origin: USA Package Contents: UTG Pro AR Pistol Receiver Extension Tube Kit UTG Pro TLU008-KIT: AR Pistol Receiver Extension Tube Kit / Matte Black