?? about FX Impacts

I sent mine to SPAW. Ken Hicks custom tuned 

https://spaweapons.com/

1st gen. Upgraded to 700mm 30 cal custom Ernest Rowe valve.

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No mostly just Impact-X's come with the X-barrel although there were a few of the late gen2 Impacts that got them also. If you are looking for a used Impact try to get an Impact-X rather than just a Impact gen1 or gen2 as there were improvements made not to just the barrel but to the regulator, trigger block, trigger system ect. ect. that would cost more to upgrade, over $600, than they are worth. Still you can modify the earlier Impacts to perform as well as the later versions.
 
For most part you can swap the barrels n other parts to make it and X. But you would want the amp reg to begin with if possible. It comes with the 10mm washers instead of the 8mm


I'd much rather have the Huma and 8mm washers do just fine. I can adjust from 100 bar to well over 170 with no problems. 102 fpe in .30, second gen Impact X.
 
I bought a used Impact a while back, Gen 1 with a standard Smooth Twist barrel. I bought the X Barrel upgrade and to be honest, it didn't make any accuracy difference at all. Anything under 100 yards really doesn't seem to make a difference.

If you aren't shooting competition, the Gen 1 with a standard barrel is a phenomenal gun. If shooting competition, get the most recent version. The upgrades will give enough edge to make it worth while. 

The 700 mm X barrel, larger air plenum, AMP Regulator, and other goodies will really help competition but I really don't see them being that valuable for hunting.

Just my opinion