By firing non-stop, etc., I mean the AC/2s were 30mm (MGs are 20 to 25mm) and basically did its rated damage in 10 seconds of constant fire with an excellent targeting system, not 1 shot like we get in MWO. The specific AC/5s used on the Jagermech I haven't found a listing for but they tend to be between 40mm to 120mm in the books. (a 120mm model is specifically stated to require 3 shots to do 5 damage and was slow as heck to shoot and slow to reload).
Of course battletech armor is half of what we have, and the Jagermech's 192 stock armor is actually 96 with more structure health than armor health. It was made of paper, but never, ever got close to the field and well defended by allied units. But that's just lore and source.
(Basically autocannons could do good damage but it took a bit of time and lots of firepower; the Jager depicted on the background to the right of this post for example is ejecting LOTS of shells with its rapid fire AC/2s and AC/5s. They were heavy, DPS-style weapons but great when 90% of mechs used single heatsinks due to their incredibly low heat which was 1 to 7 per 10 seconds, not 1 to 6 heat per shot.)
(Lasers were significantly superior, but a stationary mech firing 9 ML at 3 heat each [MWO has them at 4 heat each] brought you to 90% heat, caused your ammunition to explode, heatsinks to melt, damage to weapons, slowed you down, and sometimes caused you as the pilot to lose consciousness not to mention the mech to have a chance of falling over. Oh and shutdowns randomly occurred between 60 and 100% heat as anything above 60 was highly detrimental to any mech's well being. This is without MWO's ghost heat, too! The wonders of 30 threshold.)
Of course, if it did pick up twin AC/20s which is very unlikely, they would be of the Pontiac 100 style (described as a 100-shot AC/20, dealing 0.2 damage per shot) up to the Crusher (150mm, deals 2 damage per shot) as anything much higher than that might rip its own arms off or cause it to fall over from the recoil.
The CEO of PGI didn't like the "MG" or burst style of ACs in past games since they sounded dinky and weak and wanted tank-sized projectiles with "lots of power."
Just to note: a
40mm weapon in use.
A
120mm weapon in use.
If done right, it'd be big tank-sized projectiles with lots of visual firepower, just less at once and more over time.
Clan UACs will be using a style like this according to Paul; lead designer. So I'm thankful for that.