JLMK uses the Strike Industries EMG SMC P320 Kit to install on the SIG Air P320 GBB Pistol for this CCK build. The Strike Industries EMG Strike Modular Chassis ‘SMC’ Alpha Kit is an aluminum alloy kit for SIG AIR Proforce P320 series gas airsoft pistols, featuring a picatinny stock base, under-rail, ambidextrous QD sockets, and an included Picatinny-compatible Strike Industries XTRA MAG for an extra magazine. It is lightweight and durable with multiple accessory, stock, and slinging options.