[Lockark]

Hey. 1st off I'm new to airsoft, and getting ready to order my 1st gun. I realy want a RPK, but have been told by others that if I'm going CYMA I will need to put money into upgrading parts and ect.

I have found detailed youtube videos showing how CYMA RPK's break down, and how to disassemble/reassemble V.3 AK gear boxes. At this point I feel comfortable about attempting to upgrading this gun my self, and feel up to the challenge.

So here are my questions:

1) I've been told from reviews I've read that the Gears and O-Ring in the CYMA RPK should be replaced from what comes stock. Is their any other parts I should upgrade from the stock gun? For example the piston?

2)I don't know witch brands of parts are the "good" and witch ones are the lemons. I was hoping people could sujest to me brands and retailers for these parts?

I'm looking at the VS parts mostly ATM, but if their is better please let me know!

3)Some reviews say that the stock M130 spring in the gun can shoot abit hot for some feilds. If I need to switch this spring out for something a step down to get the FPS legal, what spring would that be?

Thank you for takeing the time to read my post. =) I tried to make sure I did as much reading as possible, but had a hard time finding answers to these specific questions. Any and all advice is appeceated! This being my 1st time attempting something like this, I'm hopeing to learn as much as can from thows more experience.