Well Mb05 Barrel How Can I Make My Stock Airsoft Sniper More Accurate?

How can I make my stock Airsoft Sniper more accurate? - well mb05 barrel

http://www.airsplat.com/Items/AR-WELL-MB ...

It is the weapon I have is pretty accurate, but I wanted to be able to reach a target consistently at 100 yards. Should I replace the foam separators, high quality, others? Should I upgrade the barrel, better Spring Guide, etc? Please send a link.