Socomgear have sent over a video for the installation of the Madbull Hitman M9/M9A1 compensator:
The Madbull Hitman M9/M9A1 compensator is a full metal, engraved, extremely awesome addition to your M9/M9A1. Installation can literally take less than a minute. In just a few simple steps you can alter your M9/M9A1 to assassin status! It not only works for the Socom Gear Hitman, but it’s compatible with any M9/M9A1 Socom Gear, WE tech, and KJ Works M9/M9A1 GBB pistols.