The funny/best part about this update is because I have been wishing that your turrets didn't explode just hours ago.
Exploding turrets in the stock game bothered me as well - my understanding is that Tynan wanted to simulate ammo cook-off, but more often than not a group of raiders simply surround and melee the turret, so it didn't make sense to me that a turret would explode from being smashed with a club or something.
Incidentally, Combat Extended also doesn't use CompProperties_Explosive for their turrets, so I removed them from the stock version of DMGTP as well for consistency.
Why is the magazine capacity of the turrets so low? Any chance to increase it?
The turrets' magazine capacities were based on real-world data.
In the case of the M134 Minigun, while 3,000 and 4,000-round ammo magazines do exist, Combat Extended has a technical limitation in that the maximum stack size (and maximum amount that pawns can reload) for its 7.62×51mm NATO is limited to 500 rounds. After consulting with CE's author NoImageAvailable, we decided to cap the M134 Minigun turret's ammo capacity to 500 rounds.
So no, CE will not allow the limit to be increased.