Multi-choice problem: Continue writing the next sentence in this paragraph:

How to access the mechbox in a classic army sar airsoft gun 
Take precautions : 
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.

Options are: (i) 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. (ii) Make sure your ammo is always available. You can purchase ammo from a battery retailer. (iii) Check the autofit software that came with your machine, and make sure you haven't accidentally gotten it broken. Be aware that a mechanical chamber is a useless place to put your gun. (iv) Always reshop with your gun before starting a new one, in case any parts thereof are needed in order to put anything back in. Also never get frustrated if your gun doesn't do its job.
(i)