Double Bell Full Metal 40mm 3-in-1 M203 Gas Grenade Launcher for M4/M16, Tan

Want area effect without carrying a second gun? The Double Bell M203 mounts under your rifle's rail and fires 40mm gas-powered rounds, so you get an underbarrel grenade launcher that's part of your primary loadout rather than a separate piece of kit.

Built like the real thing. Full aluminum body with a CNC-machined barrel. This isn't polymer that flexes when you mount it or shifts alignment between shots. The tan finish matches common FDE furniture colorways. Weight adds meaningful heft to your build — you'll feel it when you run, which is the trade for a launcher that doesn't rattle loose on the rail.

Mounts where your rails are. Designed for standard 20mm Picatinny accessory rails, which means it fits any M4/M16 series AEG, GBB rifle, or HPA build that carries them. It attaches to the forend rail, not the top rail, so your optic stays undisturbed. Once mounted, aim by angling the entire rifle — the trajectory is high arc, and the launcher does not have its own sight system.

3-in-1 design. Beyond the standard underbarrel mount, the M203 can be used as a standalone launcher with an attached stock or grip, or mounted in alternative configurations. That versatility is useful if you want to run it as a dedicated launcher for a specific role rather than always paired under a rifle.

Before you buy. This is a gas-powered launcher that requires 40mm airsoft grenades — they are not included and are sold separately. Make sure the rounds you pick are rated for a gas-operated M203 system. The launcher needs green gas or CO2 to fire, so budget for gas canisters and a compatible fill adapter. Check your field's rules on underbarrel launchers and explosive-style equipment before your first game; not all fields allow them, and those that do often have their own MED and safety requirements for arcing projectiles.

Ships as the launcher only. Grenades, gas, and mounting hardware compatibility should be verified against your rifle's rail before your first field day.