FNH 16s Armorer's Tools allow for barrel changes, bolt work, and trigger installation to be performed properly. Tools include: 16s Barrel Straightness Gauges, Ejector Removal Tool, Ejector Installation Tool, and Trigger Module Mounting Axis The Barrel Straightness Gauges ensure proper alignment of the barrel with the receiver when reinstalling 16s Barrels The Ejector Removal Tool allows for 16s ejectors to be easily removed from the bolt body The Ejector Installation Tool allows for 16s ejectors to be reinstalled with ease The 16s Trigger Module Mounting Axis ensures that the trigger module is installed properly into the Trigger Housing All tool Mfg: Brownells