The M500/M600/M650 family belongs to the early wave of purpose-built .50 caliber precision rifles.
Modern Firearms traces the Model 500 to Research Armaments Prototypes work led by D. Haskins, with later AMAC, M600, and M650 developments connected to Iver Johnson, Daisy, RAD, and RAMO Defense contexts. GlobalMilitary summarizes the family as anti-materiel sniper rifles using .50 BMG and other large calibers.
The rifles were designed for long-range fire against equipment, light materiel, and other hard targets.
The family used large-caliber cartridges such as .50 BMG to extend range and target effect beyond standard sniper rifles. The M500 was an early single-shot concept, while later M600 and M650 versions explored larger receiver and magazine arrangements. These rifles fit the anti-materiel niche rather than ordinary infantry precision-fire roles.
The family is historically useful because it predates or parallels better-known .50 caliber rifle adoption.
These weapons did not become as famous as the Barrett M82, but they show that U.S. interest in .50 caliber precision rifles was broader than one manufacturer. Their limited procurement and evolving corporate lineage make the page useful for readers comparing early anti-materiel rifle development.
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