The B&T APC9K is a compact 9mm submachine gun manufactured by Brugger & Thomet. It has a 4.3-inch barrel and a closed-bolt blowback operating system. The monolithic upper receiver integrates a Picatinny rail for optics, and the M-LOK-compatible handguard allows accessory mounting. All controls (safety, charging handle, and magazine release) are fully ambidextrous. Its compact size suits close-quarters use and vehicle operations.