Enlarged battery room:
   
 
Upper receiver cover with reinforced rib and real size.
 
The enlarged battery room is able to fit the 9.6 V stick battery.
Quick separated front and back body:
 
Loose the two slotted screws beside the body.
 
 
Loose the two screws for fixing HOP-UP.
   
Pull out the front then raise it.
 
Front  and back body can be separated instantly.
 
Easy to adjust HOP-UP.