C8 body!
 

Ok, I've been looking into this for a while now, and I'm absolutely stumped. I have an AGM M4a1 and I'm looking to fit it with a C8 body, so first order of business:
G&P or Guarder? I heard the guarder bodies have compatibility issues.
*I'm aware of the different markings. It doesn't matter to me.

2nd:
Where could I buy one? I currently live in Poland so i'd need to find a retailer that does shipping to Europe. Unless someone is willing to sell their own :P

Many thanks.