XM148 grenade launcher

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Launcher, Grenade, 40 mm, XM148

Type	Grenade Launcher
Place of origin	United States
Service history
Used by	U.S. Army, Australia
Wars	Vietnam War
Production history
Manufacturer	Colt Firearms
Specifications
Weight	3 lb (1.36 kg)
Length	16.5 in
Barrel length	10 in

Cartridge	40x46 mm grenade
Action	Single shot
Muzzle velocity	247 ft/s (74.5 m/s)
Maximum range	437 yd (400 m)
Sights	Quadrant Sight

The XM148 was an experimental 40 mm grenade launcher developed by Colt Firearms as the CGL-4 (Colt Grenade Launcher). Colt manufactured the launcher for field testing during the Vietnam era.

It was designed for installation below the barrel of M16-type rifles, and was intended to replace the stand-alone M79 correcting the problem of grenadiers relying on pistols as a secondary weapon. After problems with the experimental design were discovered, the XM148 was replaced by AAI Corporation's conceptually similar M203 design, currently the primary grenade launcher used by the US armed forces and others today. Originally made for use with the M16 Rifle, the XM148 was also used by US Special Forces in conjunction with the XM177E2 and the Australian SASR in cunjuction with the modified L1A1, nicknamed "the bitch".

The launcher's barrel could slide forward to accept a single 40 mm round into the breech. It came with a primitive version of the quadrant sight later used with the M203. It differed from the later model by featuring an external cocking handle and an extended trigger that allowed the weapon to be fired without removing the hand from the rifle's pistol grip. This same extended trigger was also one source of the weapon's problems as it allowed accidental discharges of a loaded weapon if caught by tree branches, gear, or anything else capable of overcoming the 6 to 11 pound trigger pull.