Modeled the grenade pistol from Helldivers 2. It works just as it does in game with the under barrel being able to slide out and pivot to allow you to put a 40mm Grenade into. I modeled the grenade from real life 40mm grenades so I don't know if they'll be a direct match. It is still a work in progress but the initial version came out fine. I ran out of filament printing V1 of this so thats why the barrel is 3 colours. Safety switch might be added at a later date. The iron sights just use 1.75mm filament. no glue required but you can if you want to.

DOES NOT FIRE

BOM
6.5mm OD x 30mm L (For Trigger)
5mm OD x 10mm or 15mm long (For grenade Latch) (haven't tested new version yet)
4x   M4*8mm Button Head 
4x   M4*12mm 
       M4*16mm
       M4*6mm
       1mm OD rod >20mm
4x  5mm OD x 2mm Magnets (For Barrel)