The Universal Cage Accessory can be used to run the Alaskan360 on 9mm pistols and sub guns. The Universal Cage Accessory allows for existing Obsidian 9mm mounting options (Booster Assemblies, Fixed Mounts, and 3-Lug Mount) to be used with the Alaskan360. The Universal Cage Accessory comes with a cage, spring, retainer and multi-tool. Pistons in a variety of thread pitches are sold separately.