XM174 grenade launcher

{{Infobox weapon

|name= XM174

| image= XM174 grenade launcher at Quantico, Spring 1969.jpg

| image_size = 300

|caption=

|origin= United States

|type= Automatic grenade launcher

|is_ranged=YES

|service=

|used_by= See users

|wars=Vietnam War

|designer=

|design_date=1968

|manufacturer=Aerojet Ordnance Manufacturing Company

|unit_cost=

|production_date=

|number=

|variants=

|spec_label=

|weight= 7.25 kg

|length= 712 mm

|cartridge= 40×46 mm

|caliber=

|barrels=

|action=Simple blowback, closed bolt

|rate= 350 RPM

|velocity=

|range=

|max_range=

|feed= 12 round drum magazine

|sights= Iron

}}

The XM174 is a mounted automatic 40 mm grenade launcher heavily based on the M1919A4 machine gun and the M79 grenade launcher, but fed from an ammo can.https://www.militaryfactory.com/smallarms/detail.php?smallarms_id=390 It was used in the Vietnam War as a tripod mounted crew-served weapon and as a weapon mounted on various vehicles and aircraft. The XM174 has the same fire control group as the M1919A4.https://www.historicalfirearms.info/post/163541774724/xm174-grenade-launcher-in-the-early-1960s

The ammunition was held in a drum canister with a maximum capacity of twelve 40 mm rounds. The launcher was also capable of semi-automatic fire.

U.S. Air Force Security Police personnel in Vietnam were also issued the XM174 automatic grenade launcher which was often used on perimeter defense posts and heavy weapons vehicles.{{Cite web |title=NAM 64-75 /zbrane/ XM174 |url=http://nam.wz.cz/zbrane/xm174.html |archive-url=https://web.archive.org/web/20220330074308/http://nam.wz.cz/zbrane/xm174.html |archive-date=30 March 2022 |url-status=dead |website=nam.wz.cz |access-date=7 July 2024}}