SystemA really won't change a much. Same design.
If you really want to get creative, and keep your gun shooting under 330fps (max for this barrel)
Then I actually suggest,
http://www.wgcshop.com/pcart/shopper...s%20for%20AEGs
and this (the V hop up bucking)
http://www.wgcshop.com/pcart/shopper...%20AEG%20Parts