UTG Pro AR15 6-position Receiver Extension Tube Mil-spec 7075-T6 Matte Black. Finished in a Matte Black Type III Class 2 Hard Coat Anodize with a Dry Film Lube Coated Interior Specifications for UTG Pro AR15 6-position Receiver Extension Tube 7075/T6 Aluminum: Manufacturer: UTG Pro Color: Matte Black Finish: Matte Anodized Fabric/Material: 7075-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Handgun Length: 7.25 in Condition: New Weight: 4 oz Features of UTG Pro AR15 6-position Receiver Extension Tube 7075/T6 Aluminum: 6 position Mil-Spec Carbine length Reciever Extension Tube Precision Machined from 7075-T6 Aircraft Aluminum with a Dry Film Lube Coated Interior for Smoother and More Reliable Cycling Compatible with AR15 Carbine Buffers AR15 9mm buffers and AR308 2.5" Short Buffers. Finished in a Matte Black Type III Class 2 Hard Coat Anodization Package Contents: UTG Pro AR15 6-position Receiver Extension Tube What firearm models does the manufacturer say UTG Pro AR15 6-position Receiver Extension Tube 7075/T6 Aluminum is compatible with? The manufacturer says that UTG Pro AR15 6-position Receiver Extension Tube 7075/T6 Aluminum is compatible with AR-15UTG Pro TLU001MS: UTG PRO Buffer Tube AR-15 Mil-Spec 6-Position 7075-T6 Aircraft Aluminum Matte Black