Stupid Airsoft does an upgrade of an Lambda Defense GHM9G, with a focus on replacing the small stock handguard with a longer, 3D-printed version. His primary goal of the modification is to increase the amount of rail space available for accessories and to accommodate a longer inner barrel for improved accuracy and FPS. The parts installed include a new 3D-printed handguard and grip, a longer outer barrel, and a thread protector, with the printed components specifically made from ASA plastic.

Another upgrade using 3D Printing technology as shown by Stupid Airsoft for the Lambda Defense GHM9G... "In today’s video, I’m upgrading the Lambda Defense GHM9G with two brand-new 3D printed parts: a beefier AR-style grip and a charging handle extension. This is part of my side series where I take airsoft replicas and kit them out with awesome 3D printed parts you can download and print yourself.