In order to eliminate the need for heavy recoil mechanisms, some guns are built with a nozzle in the breech, so that part of the propellant gas can flow backward and counter-balance the momentum of the projectile and the part of the propellant that moves forward. This is true by Newton's third law of motion. The momentum manifest within a gun system during the firing of the weapon is equal and opposite to sum of the momentum imparted to the projectile launched from the gun and that of the propellant gases subsequently ejected from the gun system. 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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