Colt M203 40mm Grenade Launcher

Early production Colt M203 underbarrel 40mm grenade launcher. Designed for permanent attachment to M16-series rifles (M16A1/A2). Includes the specialized M16 handguard assembly, complete mounting hardware (receiver/barrel clamps, brackets, and fasteners), and launcher sight (leaf sight; quadrant sight if present with the kit).

Condition: Clearly used with honest wear, finish marks, and handling evidence. Fully functional — barrel slides freely, action cycles correctly, safety and trigger operate as designed. No cracks, major damage, or missing parts.

Specifications

• Caliber: 40×46mm SR (low-velocity)
• Action: Single-shot, breech-loading, sliding-barrel
• Overall length: 15 in (380 mm)
• Barrel length: 12 in (305 mm), rifled (6 RH grooves)
• Weight (unloaded): 3.0 lb (1.36 kg)
• Muzzle velocity: ~250 fps (76 m/s)
• Effective range: 150 m (point target) / 350 m (area target)
• Maximum range: ~400 m
• Sights: Leaf sight (handguard-mounted); compatible with quadrant sight
• Mounting: M16-specific handguard and hardware kit

Original Colt early production model with period-correct mounting and sight components. Ready for use or display.