CYMA CM.030 Airsoft Gun G18C AEP Question?

I have just bought the CYMA CM.030 AEP today. I am wondering if it is worth it to buy an extra battery and another big bb magazine. If so where can I get them? Just leave me a link! Also is there any other accessories that are a must have for this gun? Or is there any tips I should know when using this gun? I am... show more I have just bought the CYMA CM.030 AEP today. I am wondering if it is worth it to buy an extra battery and another big bb magazine. If so where can I get them? Just leave me a link!

Also is there any other accessories that are a must have for this gun? Or is there any tips I should know when using this gun? I am using it as my sidearm but I still want it to be good.

ALSO I AM NOT LOOKING TO SPEND A LOT OF MONEY!
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