I've read some bad reviews for this gun and crossed my fingers when I bought it but the gun I recieved had no problems with it at all. It was relatively easy to open up and put the batteries in, just use a screwdriver.
My sone loves it and uses it with or without his being in his jango fett costume. GREAT gun, it's held up to a very active 4 year old in the month that we've had it. Hopefully it'll last for a long long long time since he loves it!