Originally Posted by Amos
Then you don't have enough gas in the mag for more than a couple shots.
Greengas blowback systems are evolving...
May I ask what gun you're using that you've noticed cool-down with?
I've used a TONNE of GBB's and I only find cool-down to be present in poorly maintained and low-quality GBB's.
Use a TM or a KSC gun and you wont notice it at all.
I haven't actually experienced it in an actual gun. This was more in the way of abstract thought, and also how propane is affected by cold temperatures in the winter, or a WA M4 shooting on fully automatic may experience a cool down from all the gas venting.