TRW Low Maintenance Rifle

{{Infobox weapon

|name=TRW Low Maintenance Rifle

| image= Line drawing TRW LMR.tiff

| image_size = 260

|caption=The TRW LMR.
Minor differences exist in the stock, handguard, and sights given the various prototypes made.

|type=Full-automatic fire only insurgency assault rifle

|origin={{flag|United States}}

|is_ranged=yes

|designer=Donald A. Stoehr (1927-2011){{Cite web

|url=http://www.thefirearmblog.com/blog/2009/02/24/50-bmg-flechette-rifle/

|title=The Firearm Blog » .50 BMG Flechette rifle

|work=The Firearm Blog

|date=24 February 2009

|accessdate=September 22, 2010

|archiveurl=https://web.archive.org/web/20230409112806/https://www.thefirearmblog.com/blog/2009/02/24/50-bmg-flechette-rifle/

|archive-date=April 9, 2023

}}

|design_date=February 1971{{Cite web

|url = http://www.thegunzone.com/556dw-6.html

|title = The Gun Zone -- A 5.56 X 45mm "Timeline" 1970-1973

|work = The Gun Zone

|accessdate = September 22, 2010

|url-status = dead

|archiveurl = https://web.archive.org/web/20120925135146/http://thegunzone.com/556dw-6.html

|archivedate = September 25, 2012

}}

|manufacturer=TRW Systems Group

|unit_cost=Specified cost of less than $130 (1971),{{cite web|url=http://www.aiaa-myaerospace.org/rhtp/stories/sellars_career.pdf|last= Sellars|first=John R|title=Some Memories of My Career.|publisher=Aerospace Corporation|date=19 September 2007|page=17|archiveurl=https://web.archive.org/web/20100705065915/http://www.aiaa-myaerospace.org/rhtp/stories/sellars_career.pdf|archivedate=5 July 2010|accessdate=11 May 2013}}

|production_date=1971—1973

|number=fewer than 10.

|weight=Unloaded: {{convert| 3.30|kg|lb|sigfig=2|lk=on|abbr=on}}{{harv|Jorgensen|2003|p=13}}
Loaded: {{convert| 3.64|kg|lb|sigfig=2|lk=on|abbr=on}}

|length={{convert|871|mm|in|sigfig=3|abbr=on}}

|part_length={{convert|493|mm|in|sigfig=3|abbr=on}}{{harv|Dockery|1983|p=49}}

|cartridge=5.56×45mm NATO

|action=Roller locked open bolt
gas-operated long-stroke piston

|rate=450 RPM Cyclic

|velocity={{convert|3248|ft/s|0|abbr=on}}

|range={{convert|460|m|ft}}

|max_range={{convert|2425|m|ft}}

|feed=20, 30-Round STANAG magazine

|sights=Rear: Two-position flip aperture
Front: Adjustable post

}}

File:Low Maintenance Rifle.jpg

The TRW Low Maintenance Rifle or LMR was a proposed insurgency weapon designed by TRW Inc. (formerly Thompson Ramo Wooldridge) of the United States during the Vietnam War. The intent was to produce an easy-to-use and operate firearm which could be disseminated to insurgent forces supporting the United States' military interests. The design utilized the same 5.56×45mm NATO ammunition and STANAG magazines as the M16 rifle. It would have been equipped with the M6 bayonet along with its M8A1 scabbard.

Development began in 1971, and ceased in 1973 with the weapon never having been fielded.