Over the centuries, out of all the weapons used by combat craft across the inner Sphere and Periphery the Autocannons, ranging from the piddly class two to the monstrous class twenty have been some of the most common.
But as they succeeded the Rifle Cannons of yore, so to have the bog standard ACs fallen to the wayside in the face of ever advancing energy weapons and even their own inheritors such as the Light, Rotary, LBX etc. cannons. But in spite of all this, the Autocannons still march on if only because they've been produced in such vast quantities over the centuries that you can still trip over them ever mile or so. This may be the last era these venerable weapons show up in depending on how the next timeskip turns out, if so let's send them off with some hoorahs.
Rules are simple for the Challenge, all tech is available for your perusal up to the 3150s but must include at least one AC-2, -5, or -10. The OG variety, none of the more advanced stuff.
Special munitions may be used. No weight class or locomotive restrictions, so Superheavies and Tripods are allowed. Good luck Mech Techs, show us what jank abominations your deranged minds can come up with!
https://youtu.be/R5hCkh2AH58