[quote=@Aristo]
I've always found it useful to model my fictional weapons after real-world ones - in this case, the 40 mm Bofors L/70 cannon. Keeps things plausible and easy to figure out.
[@vietmyke]I was wondering, are MAs without the tesla drive or booster upgrades restricted solely to walking speeds, or can MAs 'skate' around the ground with wheels or some sort of low-power boosters? As in Front Mission, VOTOMS, etc.
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Indeed- most of the autocannons are based off of Infantry Fighting Vehicle weapons, scaled up in caliber occasionally, and remodeled into a rifle setup. Most rotary cannons are based off of the M61 Vulcan, or GAU-8 Avenger

In regards to movement- Heavy class MAS are stuck soley to walking and running speeds, Medium and Light can walk/run, as well as "skate" around with their boosters- hence the Medium Class' "Limited Flight Capabilities" 

The Tesla/Boosters for sustained flight is in order for them to actually go into the sky and maneuver.