The Evil Stuff prefers high pressure. It isn't bad, but you need all Evil internals for it really work well. Most everyone else is designed for Low Pressure (smoother) operation. The means the hammer/ram and valve. Doesn't look like they have any valves on ANS.
Like others have said New Designz makes the best stuff. RIP valve, Ram, and hammer are the best combo overall. Check their website too - they might have some stuff still. They made another run of valves somewhat recently.
Bolts - any short delrin bolt is good. The Shocktech bolts ANS has are good. That's what I have. ST was a bit late to the Impulse party so not many really have used them compared to the others. The biggest thing for ST was the absence of a valve design. I'd liked to have seen what they'd have done.
The Eclipse LPR kit would be good if you want to put an LPR on the gun. One you have the kit (the important thing is the small tube you'll replace the plug on the front of the gun, next to the cap with) you can pick up any autococker LPR to use.
Otherwise the 'solenoid optimizer' aka tapeworm allows you to dry fire the gun and have been efficiency.
Originally Posted by ripdisc
i still dont see any NOS parts?! those ANS parts are ok. NDZ is generally the best like stated.
NOS = New Old Stock