Airsoft NPAS for VFC GBB

Use an M3 x 5 mm grubscrew, and print using brim and supports in the orientation shown in the Cura picture, at 0.12mm resolution and a preferably rigid filament like CF Nylon, but PLA works as I tested with.

UPDATE: Added "2mm" model, which will compress your valve spring 2mm more for people who want more consistent fps on full auto