Upgrading 2 JG guns. How far can I take them?

Hey, folks. I am a fan for G3 and AUG. Plan to get both and upgrade them to my field limits (450-460fps).
My question is:
1. What do I need to replace in them besides piston? Do I need to replace motor an gears?
2. Can the GB itself handle it?
3. What bout Bore up Kits. I was told that a bore up kit can give a boost of about 20fps if airseal is done right, provided that the spring is at least M120 and that barrel is at least 509mm. How much truth is in that?

Thank you

Go to Forum.AirsoftMechanics.com

They are much more knowledgable than anybody on this forum.

Lord Griffin wrote:

Go to Forum.AirsoftMechanics.com

They are much more knowledgable than anybody on this forum.

HAHAHA thanks b1tch!

Lord Griffin wrote:

Go to Forum.AirsoftMechanics.com

They are much more knowledgable than anybody on this forum.

I'm knowledgeable enough to know how to spell "knowledgeable" and that you forgot the "s" after "forum" in the link.

Oh... you meant about airsoft. Well yeah, pretty much.