The irunguns barrels are EFK, and are excellent.
Accuracy is as good as the Glock 26, though some people like the Glock 26 better for the wider backstrap, which spreads the recoil a bit more. I was surprised by that reaction. I LOVE the Glock 43, though the Glock 19 is still more accurate, obviously, and a bit easier to shoot. This is now the smallest and lightest restricted 9mm (smaller than some .380 pistols) available in Canada. It cycled every type of ammunition, including 147 grain hollow points, and the EFK barrel, again, is excellent.
I'm surprised there aren't more aftermarket barrels for these. Of course, there is no need in the USA for 106mm barrels, but the locking lugs are identical to the Glock 19/26 barrel. Material quality has to be top notch, since there isn't much material there. Everything is just "slimmed down".
Great little pistol though.