The Leber V2  is a 3D printed MP5 lower designed to utilize an AR fire control group. This is a full DIY kit that includes all the necessary hardware to convert your MP5 to run a Super Safety. This is a kit that you assemble yourself, and as such, some fitment might be required to get the lower to fit your specific gun. We print all lowers out of PA6-CF, but upon request we can substitute for another type of plastic.