A set of 2 stocks with 2 types of body, stock deployment shape and storage shape. 20th and 30th translucent magazines. Barrel with and without suppressor. The flip-up backup site comes with two types in an inverted shape. In addition, T2 type dot sight, light, foregrip, left and right rails are also included as options, and you can finish it in your favorite style. In 2019, the new firearm APC9K was selected by the US Army as the first formal submachine gun in 76 years. The APC series developed in Switzerland is a "system weapon" that develops various variations from a common design and interface, and the APC9K is the most compact model in the 9mm caliber submachine gun line. While following the operability of the M4 series, it has a layout that thoroughly implements ambidetrax regardless of the left or right handedness, and its ease of handling is with origami.