Damn! thanks for the answers guys! I guess I forgot to mention some details about the context. So yea by let's say 350$, I kinda meant a gun that would shoots, meaning battery and charger included in the price tag. This is why the ICS one's were so interesting. (low price tag) not the sportline though.
Also, this is my first purhase, well I bought a glock in the past but apart from that, it's my first rifle/smg. So I wasn't really planning on rebuilding things and opening the gun. (not that I don't like to look into guns and disassemble them).
Anyways, all the answers you gave me lights up alot my questions, so thanks you for that.