yup I use my KJW M4 as my primary. I gone to the open house scrims first time and have to adjust my fps thanks to cradle velocity it made it easy. I brought 9 magazines and works perfect through the game well if you shoots like crazy you will need to bring amo w/you and reload. And believe me you fill like rushing your reloads like the real thing.
http://www.airsoftcanada.com/picture...&pictureid=748 and by the way its noisy in the field!! hehehe