FossMG9 Complete Kit

Product Summary

File Review BOM Five years in the making, the FossMG9 by GreenWhiskey and Skum is here!

Editorial narrative

File Review BOM Five years in the making, the FossMG9 by GreenWhiskey and Skum is here! Impress your friends and neighbors with your incredible folding suitcase gun! The FossMG9 is a folding PDW made using Glock-style parts and FMDA rails. Our complete kit is the easiest way to get everything you need to build the most anticipated release of the year! To build your FossMG9 you will need: Our base hardware kit , containing every nut, bolt, screw and spring required for the build A complete lower parts kit , containing both a Glock-style LPK and the FMDA rails to go with it A complete upper parts kit , containing a Glock-style complete slide and threaded barrel A magazine Optionally, our Metal Upgrades , providing metal hinges and arch cap to strengthen the weaker parts of the folding mechanism. Learn more about our kit with this kit breakdown video! Note: at launch, only Glock 19-style parts are compatible with the FossMG9. Future versions will support Glock 17 and possibly others. Check out our build guide to learn how to build this gun: Notes on lead times: The base hardware kits can ship out immediately Lower parts kits can also ship immediately Upper parts kits have a lead time of ~1 – 2 weeks Magazines can ship immediately Metal upgrades have a lead time of ~1 week

Facets

• Last verified: 2026-05-29