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

Do absolutely nothing to them. The G&G green hop-up rubber is actually really good. Their gray nylon hop-up chamber is perfectly OK. If anything at all, remove the barrel group, and give it a thorough cleaning inside. Wash the bucking with soap and water and let it dry, and reassemble everything.

You do have a point. It shoots quite accurate to about 50 meters. I just thought I may be able to squeeze another 10 or so meters out of them.