Originally Posted by el_guapo

There was always double barrel mortars. That's nothing new. Howitzers, or guns different story. Mortars are relatively light weight for for SP chasis, sometimes too light weight, hence why they put two mortar tubes of 120mm, or dozens of 82mm mortars such as what the Chinese have. Howitzers, and guns that are 152.4mm, or 155mm are much bigger not just in diameter, but the barrels are much longer at least 39 calibers up to 52 calibers for most artillery canons. Naturally, partly due to that reason, howitzers, and guns have longer range.