Although I don't have all the time in the world to address every question I try to answer any I feel relevant. Make sure to check out my FAQ section. Many instances exist when, even 'just once,' it was fired at something, or where someone else heard it and got scared, and the cops get called. The plastic gets too brittle and it might shatter on you. Temps above 100 F should be avoided as well, as the plastic's physical strength starts to precipitously decrease above this temperature.
High temperatures applies to multiple firings as well.
Say a continuous duty of one round every minute, or 'rapid bursts' of no more than three rounds, with a five minute wait afterwards. This of course only applies to combustion launchers. Dumping a tank of air rapidly causes a rapid decrease in the air temperature. This does NOT make a good refrigerator for beer, just be careful, no faster than one round per minute. That's all I got for now.