And whenever it fires, the gun seems to kick up way more hell behind it than what it sends out the barrel's front end. It's the M40 106mm recoilless rifle, an American-made, Vietnam-vintage weapon ...

Sporting a total of six M40 recoilless rifles on two arms at either side of the turret, the M50 Ontos could unleash an incredible amount of firepower at once. When used against enemy defensive ...