Just as an aside the only rules I've found for needing to switch out barrels after prolonged auto- or suppressive- fire is the following from the RPG game "Patrol - Military Roleplay In The 20th Century" by Erika Chappell, published by Newstand Press:
When you fire, roll a d6. If you roll equal or
less than the number of times you cleared the
track, you must either consume a Spare Barrel
or wait a Turn before shooting again.
and later:
When using a Belt weapon, roll 1d6. If you roll
equal or under the times ammo track was cleared,
use a Spare Barrel or wait a Turn to shoot again.
So converting this to Twilight we could postulate they mean after every belt change roll a 1D6, if you roll under the number of belts since the last barrel change then you either need to wait to shoot again (for the barrel to cool down some) or you need to change the barrel (effectively resetting the counter for the 1D6 roll).
Figured I'd just put this out there as a somewhat simple rule mechanic.
~Ty
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