GM Tatico checks the SIG Air ProForce MPX-K AEG if it is a good primary for close quarters games. The SIG Sauer MPX-K, a compact electric airsoft gun, is the airsoft counterpart to the real-steel SIG MPX-K submachine gun. Inspired by the AR-15/M4 platform, it features a similar layout with a closed, rotating bolt system and ambidextrous controls. Constructed from durable nylon polymer, the MPX-K is lightweight and easy to maneuver, making it ideal for close-quarters combat. It boasts an M-LOK handguard for customization, a monolithic top rail for optics, and a side-folding stock for compact storage. Internally, it utilizes a modified version 2 gearbox with a quick-change spring system, allowing for easy adjustments to power.