Air venuri 2900 psi regulator?

That'll be tricky. Not hard but you want exactly 3,000psi on the dot? ( Nah ). 
What is your sweet spot for the rifle? I have "3,000psi" rigs that have sweet spots from 1,600-2,900psi.
Or your regulated and just looking for another shot or two?

Just a matter of getting the shims right. Search here or google, maybe shimming a regulator ( you might add Ninja before reg for good hits).
You will need a reg checker.
John