Material: 6061 Aluminum with Hard Coat Anodizing, SteelAll Actual Trademarks In Deep Laser Engraved Under Authority by SLR Rifleworks LLCPackage Comes with 1 x Universal Barrel Nut to Fit Both Tokyo Marui and Systema PTW Profile Threading / 1 x Wedge Set / 1 x 8" AEG or MWS Modular Outer Barrel / 1 x SLR Airsoftworks Dummy Gasblock