ok i know a few of you are confused, and rightfully so. what i mean by o ring vs piston head is this. would a o ring piston work better than one with the cup on the front, does anybody know if there are pros and cons to the "cup" design, also does anybody know about angel custom
this is what i mean by "cup"
http://www.airsoftpost.com/product_info ... s_id=35653