The M50A1 Ontos (Rifle Multiple 106MM Recoilless fully tracked), used by the USMC in Vietnam, mounted six of these barrels on a tracked vehicle. The M40A1 system weighed approximately 438 pounds when assembled and mounted for firing it has a sustained rate of fire of 6 rounds per minute and an effective range of 1365 meters. In a more conventional system, the recoil force would be counterbalanced through a combination of slides, hydraulic-mechanical devices, and/or structural supports. Recoilless rifles are capable of firing artillery-type shells at velocities, and with an accuracy, comparable to those of standard guns, but counterbalances the recoil force of firing with a portion of the thrust of the projectile. It can be used in both anti-tank and anti-personnel roles. The M40 is an 106mm breech-loaded, single-shot, man-portable, crew-served recoilless rifle.
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