| TRW Low Maintenance Rifle | |
|---|---|
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 |
| Place of origin |  United States |
| Production history | |
| Designer | Donald A. Stoehr (1927-2011)[1] |
| Designed | February 1971[2] |
| Manufacturer | TRW Systems Group |
| Unit cost | Specified cost of less than $130 (1971),[3] |
| Produced | 1971—1973 |
| No. built | fewer than 10. |
| Specifications | |
| Mass | Unloaded: 3.30 kg (7.3 lb)[4] Loaded: 3.64 kg (8.0 lb)[4] |
| Length | 871 mm (34.3 in)[4] |
| Barrel length | 493 mm (19.4 in)[5] |
| Cartridge | 5.56×45mm NATO |
| Action | Roller locked open bolt gas-operated long-stroke piston |
| Rate of fire | 450 RPM Cyclic[4] |
| Muzzle velocity | 3,248 ft/s (990 m/s)[4][5] |
| Effective firing range | 460 metres (1,510 ft)[4] |
| Maximum firing range | 2,425 metres (7,956 ft)[5] |
| Feed system | 20, 30-Round STANAG magazine[4] |
| Sights | Rear: Two-position flip aperture Front: Adjustable post |
The TRW Low Maintenance RifleorLMR 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.
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