Ive got one of these and i have opened the gearbox a lot more than i would like.
My motor cut out on me suddenly. After a game it just stopped working. I dont know why though.
Overall a good weapon, but the sights are bad and very high. So high in fact that you will be looking into the rear of the carryhandle untill you adjust for it. Also, the pistol grip is very far back. Because of the light weight, it is no problem, but it might be a bit uncomfortable. The fireselector is also out of reach, so you better get used to walking around with your finger off the trigger.
Trigger pull is long. And i mean loooooooong. I got used to it though.
Just a quick comment