XM174
Type	Automatic Grenade Launcher
Place of origin	United States
Service history
Used by	US Army/USMC, USAF
Wars	Vietnam War
Production history
Designed	1968
Manufacturer	Aerojet Ordnance Manufacturing Company
Specifications
Weight	7.25kg
Length	712mm
Cartridge	40x46mm
Action	Recoil
Rate of fire	350RPM
Feed system	12 Round Drum Magazine
Sights	Iron

The XM174 is a mounted automatic 40mm grenade launcher heavily based on the M1919A4 machine gun and the M79 grenade launcher but fed from an ammo can. It was used in the Vietnam War and was mounted on various vehicles and aircraft.

[edit] References

• http://www.airwarvietnam.com/20sos.htm
• http://nam.wz.cz/zbrane/xm174.html

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The ammo can held 12 40mm rounds, and the automatic launcher's rate of fire permitted all 12 rounds to be in the air before the first round landed. The launcher was also capable of semi-automatic fire (one round per pull of the trigger).