The KWA B&T MP9 GBB SMG has been thoroughly reviewed, but Airsoft Chay offers his take on this compact SMG. Featuring a folding stock, MIL-SPEC Picatinny rails, active trigger safety, and an integrated vertical foregrip, it boasts realistic construction, field stripping, and a functional cocking handle. With semi and full auto modes, adjustable hop-up, and authentic bolt action, this SMG provides a lifelike experience for airsoft enthusiasts.