Hi I own one of this bad boy and as far as it goes its reliable out of the box. Outer barrel has been modified and until now it perfectly working. The rubber band has broke to me once and its not a big deal to replace I been to outside game one time and I have to open my M4 twice cause it shooting to hot for an outdoor game.This is one of the pros of this gun if you have to change anything its fast and reliable I have 9 magazine with me on the game and yeah the sounds of it echos in the field.
http://www.airsoftcanada.com/picture...&pictureid=749