I have this http://www.hobbytron.com/AirsoftAssaultRifleGunAEGWAA10CH3181.html it is a peice of stuff the creators of the gun must not have wanted you to be able to get the grib where the battery is on. I had to have some guy do it for me then i took it off for a charge and couldn't put it back on!
Problem 1: You're buying from hobbytron.
Problem 2: You should have read a review of the gun.
can you legally get one?
Trying to find a sturdy p90... i'm thinking about getting this one when it comes back in stock.http://www.airsoftgi.com/product_info.php?products_id=4716
airsoft is for soft roosters.