Double Action/Spring Return Pneumatic Actuators

[twiegner]

My team is looking to use a Spring Return piston to possibly eliminate the need of an onboard compressor (we only need 1, 6" stroke actuator). We are looking to know 2 things
1: Will spring return pistons only use the equivalent of 1 burst or is there a drawback to these actuators?
2: Where would we get one of these actuators, our normal supplier is Bimba but I can't seem to find larger spring return actuators. I found mini actuators but they only have a max of around a 2" stroke and we need 6".