|
Out of the box, the better quality clones like JG are pretty decent. I've put almost 2500 rounds through my stock JG MP5 without any issues to date. I've got about 500 through my JG HK416 also without issue either. I don't plan on opening up either mechbox until something fails. Then I'll replace the broken parts and any other worn parts at the same time.
At a very minimum though, on any clone, you should consider replacing the bushings with metal ones, and if the mechbox is overly greased (common with clone guns), clean the mechbox, reshim it, and regrease it. That in itself should increase the gun's reliability pretty significantly.
If you really want to upgrade the internals, then replacing the whole compression system short of the cylinder is a good idea. If you're happy with your velocity, then you can keep the stock spring, as there's nothing wrong with those. A new spring guide, piston, piston head, and cylinder head would be good choices. A new nozzle and hopup rubber would also be recommended upgrades.
__________________
|