TRW’s Low Maintenance Rifle seems to have been the result of a program to use a blank slate and a modern space age scientific mindset to develop a rifle that would be more reliable and effective than other existing designs. It was contracted to TRW during the Vietnam War, and they produced a very light, long stroker gas piston rifle with a roller locked bolt. It was chambered for the XM216 single-flechette cartridge, with a muzzle velocity of a screaming 4700 fps. After production of three prototypes, the design was revised to use standard 5.56mm M193 and M196 ammunition. Three more rifles were made in this form before the program was cancelled in 1973 as the end of the Vietnam War caused funding to dry up for this sort of thing.
Thanks to the Ordnance Training Support Facility at Fort Lee for giving me access to this fantastic artifact!
You can find the full Low Maintenance Rifle technical manual here:
Anyone have any info on accuracy and controllability testing?
Be interesting to see flechette vs. 5.56 out of the same gun.