From US Army FM for the M203:
The M203 grenade launcher is a lightweight, single-shot, breech-loaded, pump action (sliding barrel), shoulder-fired weapon that is attached to an M16 rifle series (Figure 3-1), or the M4 carbine series with the M203A1 (Figure 3-2), and M4 carbine series with the rail system (Figure 3-3).
No. The M203 is a grenade launcher.
Solvent and a M203 Bore Brush for 40mm.
M16 with a M203 grenade launcher
M16 with a M203 grenade launcher
in modern times an m203 can be shot from an m203 grenade laucher. i noticed that it said japan ww2 times so there is also a mod to an m1 grand where using force lauches an m1 grenade. m203 are usaly attached to m4 and m16 but other guns also can be modded for this.
Because such a mount hasn't been manufactured.
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