Double Bell M203 Long Grenade Launcher

Double Bell M203 Long Grenade Launcher

Key Features
- Full-metal construction for durability and realistic heft 
- Designed for M4 / M16 style rifles — simple under-barrel mounting
- Accepts standard 40mm airsoft grenades (sold separately) 
- Long barrel variant (M-55L) for improved sight picture and clearance
- Reliable latch and hinge system for quick loading and safe retention
- Realistic external controls and blank-firing compatible aesthetics 

Give your primary a new role — real weight, real mounting, real options: the M203 that turns an M4 into a multi-role platform.

Description.

The Double Bell M203 Long Grenade Launcher (model M-55L) is a purpose-made under-barrel accessory that adds 40mm ordnance capability to compatible platforms. It bolts under M4 and M16 pattern Rifle handguards with a familiar clamp-and-screw interface and behaves like a straightforward, no-nonsense tool: hinge the barrel, load a 40mm grenade, and close. The unit is full metal, black finished, and finished to tolerate regular handling and the knocks of field use.

Design is honest. The long-barrel layout gives extra clearance for optics, a slightly longer sighting plane and more room for foregrips or angled attachments on the host weapon. The launcher uses a swing-out / hinge action for loading and a secure latch to hold the barrel shut during transport and firing. The external controls are simple — a push-to-open latch and a positive indexing mechanism — which means you don’t fiddle during a reload when the team is moving. Everything is positioned to be reachable without removing the host rifle from the shoulder for more rapid employment in skirmish scenarios.

Compatibility matters and this unit was made with the M4 / M16 pattern in mind. The attachment interface matches common rail and under-barrel mounting geometries, so fitting to a standard M4 carbine-length receiver or an M16-length host is straightforward. Because it mounts under the barrel, it doesn’t interfere with primary optic placement beyond the normal considerations of length and sight picture; in practice you mount the launcher low and leave your top rail for the red dot or scope. Installation is a hardware swap: bolt the mount to the host handguard or dedicated bracket, tighten to spec, and verify zero and clearance before use.

Performance in game comes down to payload and handling. This M203 accepts 40mm airsoft grenades.

Use cases and tactics: the M203 Long is a utility tool for team leaders, objective defenders and role-players who want more than just single-target hits from their primary AEG or GBB. Use impact grenades to deny a choke point; use gas bloom or sound-effect grenades to simulate suppression during a breach; or outfit a demonstration kit for training and scenario events. In practice a team with one or two launchers can shape enemy movement and create opportunities for flanking teams — but remember, firing grenades requires planning: they are an area effect, not a precision strike.

For the buyer who wants a tidy, robust and realistic under-barrel launcher, the Double Bell M203 M-55L is a practical choice. It gives you 40mm capability without a heavy weight penalty, mounts where most operators expect it to, and keeps maintenance simple. It won’t make you a grenadier overnight — that still comes from good tactics and practice — but it will reliably add the options you want to your loadout and hold up to regular play.

Other Great Features are,

Full metal shell for durability and realistic weight 
Hinge and latch loading for fast reloads in the field Direct bolt-on fit to M4 / M16 pattern handguards 
Accepts standard 40mm airsoft grenades for flexible loadouts

In the box:

- Double Bell M203 Long Launcher (model M-55L) x1.
- Mounting hardware pack (screws, clamps and Allen keys).
- Basic user sheet and safety guidance.
- Note: 40mm grenades are NOT included and must be purchased separately.

Specifications

Model : Double Bell M203 Long (M-55L) — Full Metal, Black
Compatibility : M4 / M16 pattern under-barrel mounting (verify fit to host handguard)
Calibre : 40 mm (airsoft grenade format — grenades sold separately)
Material : Full metal construction (steel / alloy; black finish)
Loading : Hinge / swing-out barrel with positive latch
Included : Mounting hardware (screws and clamps); user safety sheet
Notes : Grenades, rifle, batteries and other accessories not included. Confirm fitment with your host weapon before first use. Follow site rules and local laws for grenade use.

If you spot the Double Bell M203 Long (M-55L) listed at a lower price elsewhere in the UK, pass us the link and we’ll match and beat that price — see our price match terms and we’ll sort it out for you.

Sku :

212386