[burtonsb101]

I own the Airsoft gi upgraded triggerbox, and I must say, it's pretty decent. Definetly not a zero trigger, but better than a stock trigger box. It's full metal with nice upgraded sears. It also has the capability of replacement parts, unlike a lot of zero triggers. Also, +1 for the pdi chamber. It is awesome. Before you buy any power upgrades I would start with that and a nice aeg barrel. But, like many say the more expensive the parts, generally the better they are.

 

[burtonsb101]

I have made the mistake of buying the stock cut 499mm madbull barrel with my pdi hop up. It will slide in the hopup, but there are certain groves cut on an aeg barrel that are not on the stock barrel. These help to align the rubber and lock down the barrel in the hop up. It is made for aeg barrels.