About the M40 Rifle
The M40 rifle has served as one of the most recognizable precision rifle platforms in United States Marine Corps history. Beginning with the original M40 during the Vietnam War, the platform evolved through multiple generations as Marine Corps armorers refined the rifle around changing operational requirements, improved optics, stronger stocks, detachable magazines, suppressor capability and eventually a fully modular chassis system.
Chambered in 7.62x51mm NATO, the original M40 rifle was built with a wooden stock and featured a variable Redfield scope. The wooden stock, however, tended to swell and warm in hot, humid environments, necessitating a refinement of the platform that culminated in the M40A1. The M40A1 established the classic Marine Corps sniper rifle configuration with its Remington 700 short action, heavy match barrel and McMillan fiberglass stock. The M40A1, however, like the original M40 with its one-piece walnut stock, didn’t offer a great deal of adjustability to the shooter. Later iterations of the rifle would improve on these features of design. The M40A3 modernized the platform with the adjustable McMillan A4 stock and updated mounting system. The M40A5 added detachable magazines, a suppressor-compatible muzzle system and provisions for forward-mounted night vision. The M40A6 represented the final major evolution of the platform, replacing the traditional fiberglass stock with the modular Remington Defense RACS chassis, delivering an exceptional degree of adjustability, modularity, and expandability to suit a variety of different shooters, circumstances, and environments.
The B&B Firearms M40A1, M40A3, M40A5 and M40A6 are built for collectors and shooters who want more than an M40-inspired rifle. Each model is configured around the historically appropriate components, dimensions and features associated with its respective generation, using original-pattern components and parts sourced from original manufacturers where available.
Our goal is to preserve the characteristics that make each generation immediately recognizable as an M40 sniper rifle, from the traditional lines of the M40A1 to the modern modular construction of the M40A6.
Whether you are looking for an M40A1, M40A3, M40A5, M40A6, or building a complete collection of M40 rifles, these rifles provide an opportunity to own a newly manufactured, historically faithful recreation of an important chapter in American military precision-rifle history.
Each B&B Firearms M40 is built to order with an estimated 6–8 week lead time.
