기하와벡터 (Geometry and Vectors), does a quick shooting test of the Archwick APC9K SD² made for B&T Air. The B&T Air GBB APC9K-SD2 is an officially licensed airsoft replica of the B&T USA's APC9K, which was selected by the U.S. Army for its Sub Compact Weapon (SCW) trials. 

This gas blowback submachine gun features a durable CNC-machined 6061-T6 aluminum upper receiver and steel internals, with fully engraved markings that match the real firearm. At under 15 inches, it is modeled after one of the shortest integrally suppressed submachine guns available, optimized for low-visibility operations. The replica includes a full-length Picatinny rail, a widened M-LOK handguard for integral suppression, and a multi-position telescoping steel stock. It fires in both semi and full-auto modes, offering an FPS range of 290-310 and an adjustable hop-up for precision.