[header] How to access the mechbox in a classic army sar airsoft gun [title] Take precautions : [substeps] Anything you do to your gun is at your own risk, and you lose the shop warranty. Every time you take out a part, put it in a place where you're sure to find it. Remember where you got the part from so you know where to put it back. 
It might be a good idea to take a picture to remember it the first couple of times. Take out the magazine, and fire a shot or two in a safe direction.