The 3.45 inch RCL was an 88 mm British recoilless weapon, designed by Sir Dennis Burney during the Second World War.
Delayed by problems due to breech wear because of gas erosion upon firing, it did not see action, as was hoped, in the Far East, particularly Burma.
Although Burney's designs did not have high muzzle velocities, this was compensated for by the use of a shell which relied on a HESH explosive instead of speed and weight to penetrate the armour.
This was a weapon that could be fired from the shoulder, giving unrestricted traverse or elevation within the limits of the human frame, or mounted on a simple tripod.
A portion of the propelling charge bled through holes in the cartridge wall and into a space around the breech and then backwards through four venturis.