hey, got a quick question. I bought this spring "
http://www.airsoftgi.com/product_inf...oducts_id=1683 " and i went to intall it in my gearbox (i have a v2 gearbox in an M4) but it's like 2 and a half inches longer than my stock spring in my KWA.
whats going on here, is this normal for a promethius spring? or is there a specific spring I need to buy? my goal FPS is 340-350. Any light you can shed would be much appreciated.
thanks!