The GHM9 Gen 2 provides greater flexibility and modularity to the operator. The GHM9 Gen 2 accepts all APC9 PRO lower receivers, and allows the operator to change out barrels, handguards, and stocks. The GHM9 is a blow-back operated semi-automatic firearm of closed bolt design in cal. 9x19 with a single stage trigger. Operating elements such as charging handle, fire selector, magazine retainer, bolt catch and bolt release knobs are ambidextrous to operate. Other features are a flip-up sights on top accessory rails, lateral accessory rails and a three-lug-interface on the muzzle with additional 1/2x28" threading to accept suppressors.