Cheap upgrades for back up AEG M4
I have two G&G Combat Raiders I recently bought but I am planning on buying a Krytac. I would like to use the raiders as backup if something breaks and for friends to use. I know they are not worth putting much money into on upgrades but was thinking of a few cheaper ones like the hop up. I also do not have much tech experience ,so the simpler the upgrade, the better.
Any suggestions?
Thanks
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