M-67 Recoilless Rifle
Measuring 1,346-mm (53-inches) in length and weighing in at a hefty 16-kg (35-lbs), the M-67 was intended for use against AFV’s and bunkers as a portable crew served weapon. It was a breech-loaded, single-shot weapon which was shaped like a long tube with the sight assembly and firing mechanism offset to the side in opposite directions about half way along the barrel. The breech was hinged on the right side, and had to be swung open to load the round. It was then swung closed and when the rifle was fired, the rear end of the shell case broke up and was blown out of the back of the breech block.
Capable of maintaining a sustained fire rate of 1 round per minute, the weapon could be fired at an increased rate of 1 round every 6 seconds (10 rpm) by a well trained crew. However, due to excessive heating at this rate of fire, it was necessary to allow the weapon a 15-minute cooling period after each 5 rounds fired.
The maximum range of the M-67 was 400-meters (437-yds) and was sighted to 800-meters (875-yds) although the shell could actually be fired out to 2,000-meters (2,187-yds).
Requiring a crew of three (gunner, assistant gunner and ammo bearer) the M-67 fired a 9.5-lb M371E1 HEAT round and could be shoulder fired or ground mounted.