Red Deer Airsoft does an extensive review of the Maruyama SCW-9 PRO G gas blowback SMG. The Maruyama SCW9 PRO-G APC9 is modeled after the renowned B&T APC-9K, a Swiss-made submachine gun celebrated for its compact yet reliable design. The APC-9K's reputation has been further solidified by its adoption by the US Army.