The Invader PDW is a remix of the FDMA DD19.2 which turns a standard handgun into a PDW with a collapsible (self-deploying) brace and a forward magazine holder. Included in the release package is extensive documentation detailing how to print and assemble all parts of the PDW.
This platform is compatible with G19 slides. Other hardware requirements include DD19.2 rails and standard Glock finishing parts (including a full size locking block.) Other hardware is required for the self-deploying brace - technical details and fabrication instructions are included.
The Invader PDW is developed by Digital Nimbus Labs. You can purchase hardware kits and support the developer at his website https://shop.digitalnimbuslabs.com/