Optimized for “Rails Down” printing / utilizing 19.2 rails. The RD19.2 is an amalgamation of many Glock 19 frames, but is a FMDA DD19.2 at its core. These models take Gen 3 uppers and lower parts kits. Files included for either a Gen 3 or Gen 5 takedown spring. Many thanks to Ivan, FMDA, DD, PY2A! Their files have been invaluable to this work. Thanks to the testers that helped with this release!