[Marcello]

I do not know the specific doctrine for the SK-105 (or the AMX-13, which has the same issues) but it looks like an ambush weapon to me. Get in a good position, fire a few shots, get out and reload the autoloaders in a quiet place. That and maybe some infantry support. Not something meant to slug it out in the open battlefield for an extended period of time. Besides 4-5 seconds does not make it a 105mm machinegun.