MADBULL - Assassins Barrel / Hop Upgrade Socom / WE M9 - Black is a complete drop in kit designed to replace the Barrel, Outer Barrel and Hop-Up Setup in WE / SOCOMGEAR M9A1 / M9 with an upgraded barrel quickly and easily. The kit is constructed from Alloy, and comes complete with the Outer Barrel, Hop-Up Unit and Rubber, and Threaded Outer Barrel. The Kit comes pre-built for easy installation, meaning you just simply have to remove your existing Hop / Barrel setup, and drop the kit in its place. The kit is designed to increase the accuracy and range of your pistol by featuring a 235mm x 6.03mm Tightbore Barrel, and allows the attachment of suppressors with a 14mm CCW threaded outer barrel. This is the perfect purchase for those looking for a little something extra for their pistol, or for those who believe performance is a must.