The Fixed Mount is designed for carbine/subgun platforms that have fixed barrels. The Fixed Mount is a stand alone mounting accessory that replaces the booster system in the Obsidian 45/9. The Fixed Mount is not used with the 3 Lug Mount or Fixed Barrel Spacer.
For information on what mounts/accessories should be used with your host firearms check out their Pistol Suppressor Attachments Guide!
