CAA USA MCKGEN2: The extended stabilizer enables one-handed firing for better shooting performance. It also comes with a Velcro strap fastener which provides a custom fit to any user. MCK Gen 2 is the most cost-effect conversion kit in the world. Fastest assembly/disassembly conversion kit on the market. Improving accuracy dramatically. This SKU is the latest Gen 2 Variant. Please see extended description for details.