Alright I'm currently looking at these two sets of gears
http://www.airsoftparts.ca/store2/in...oducts_id=1784
and
http://www.airsoftparts.ca/store2/in...oducts_id=1574
my question is to use helical gears do I need to get a specific piston (one with helical teeth) in the picture it appears as though the teeth return to straight teeth where it engages with the piston but I'd prefer to err on the side of caution and just ask.