Most of your questions have already been answered. If you can afford it, it's most definitely worth getting a VFC over a G&G. The G&G CM lineup have polymer receivers, while being good for what they are, they'll feel like a toy next to the full metal goodness of a VFC. Look at the VFC VR16 line, starting around $350 they're a great buy. You can get a base model and put fancy furniture/rails on it later.
VFC M4's do NOT have propitiatory parts. As I already mentioned they're widely regarded as the best AEG to upgrade from. VFC M4's are completely TM spec (industry standard), when it come to parts. VFC used to have a couple internal parts known for failing over time. It was mainly due to the material they were made from. VFC addressed the issue a few years ago. Be careful you're not parroting antiquated and inaccurate information.
G&G's entry line is good at that price point but there are better guns to be had for the price of their higher tier M4's, namely VFC's.
Last edited by Kozzie; January 28th, 2018 at 00:37..
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