Took a closer look at this and heavy guns only regenerate ammo at ten percent of the normal ammo regen rate, (i.e. only 0.5% of mag per second in the case of Forge).
Now, I kinda get why they did this (although, a 90% reduction? jesus christ), but y’know, why don’t you tell us these things, Borderlands?
As far as I can tell, this applies to both Forge and Redistribution. It’s a shame because Heavy guns aren’t the instant kill buttons they were in previous games (in normal mode at least), they seem intended for actual use besides second winds etc, ammo boxes are also more generous with rockets… so why gimp Moze’s ammo regen with a massive 90% reduction?
PS: Forge stops regenning ammo if it would go over your max backpack capacity. I get why, but again, it’d be nice if they fixed this so that it properly siphons off the backpack.