Stupid Airsoft unboxes the FMG9, an airsoft replica of the "briefcase SMG" developed by Ace Tech and Poseidon. This all-polymer carbine kit is designed to house a Glock's upper receiver, sharing many of its controls. He goes over its features, including iron sights, a foregrip, and a lightweight 50-round gas magazine. Performance tests highlight its gas efficiency and unique "rattling" recoil sensation.