Dave Baks of Airsoft Obsessed goes over the features of the Sharps Bros Jack9 which is made under the EMG brand. Available in Polymer and Metal versions, the EMG Sharps Bros Jack9 AEG this has the same internals ARES Airsoft M4 45 Pistol Caliber Carbine that has a newly designed gearbox that allows for more vertical motor grip, the EFCS, and quick detach barrel assembly.