I have a paradox with just an air through grip, and my co2 tanks have anti-syphon tubes.
gas through grip
it has some pretty good accuracy. Good on gas.
no e grip.
I bought this gun and it has shot great out of the box. I'm able to shot people with just one shot, so i dont need an e grip. The metal trigger frame holds up great Ive beet the crap out of mine and it still dont miss a beat.
this is a great gun for people with low cash flow and are just begining. Also make sure to get a gas though grip and replace the plastic lines with steel braid.