The RM277 is a bullpup rifle under development by General Dynamics. It is a contender for the US Army's NGSW (Next Generation Squad Weapon) program, and is being developed for the NGSW-R (rifle) and NGSW-AR (automatic rifle) roles.

The weapon is chambered in .277 TVCM, a 6.8mm cartridge with a polymer case.

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