MCK Standard Conversion Kit Features The MCK (Micro Conversion Kit) is the next generation of conversion kits from CAA USA. It is a lightweight and sturdy platform for various handguns and has a barrel shroud made of aluminum with a polymer body. The 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. The MCK improves accuracy dramatically up to 200 yards utilizes ergonomic finger groove grip a top and side Picatinny rails right-folding arm brace and a built in charging handle. It is the most cost effect fastest assembly / disassembly conversion kit on the market. This model is compatible with Glock 20/21 Gen3 and has a flat dark earth finish. MCK Standard Conversion Kit Specifications Model:MCK Series:Standard Conversion Kit Stock Finish:Flat Dark Earth Gun Model:Glock 20 / 21 Gen3 Stock Material:Synthetic Barrel Finish:Black