Gel Blaster shooters can now equip their Gel Blasters that have rail mounts with an M203 Gel Ball Grenade Launcher. This is a 3D printed kit set made by Cool Hobby that you can assemble. As for ammo, their are already 40mm Gas Power Gel Ball Grenades available in the market... "This is a DIY Kit Set, You need to do it yourself, Enjoy DIY, Enjoy M203 Gas Power GEL Ball Grenade Launcher + 40MM Grenade KIT SET."