The rifling does not undo the hop, if anything it helps it work better by allowing air around the BB and reduces the ricochets of the inner barrel.
I've run these in loads of guns and still do in a few, in fact my short barrelled tippman has the TK barrel in it and it has great accuracy and range, considering I run the gun at 330 and the inner barrel is about 200mm long, it range isn't far off my old CTW which was hop modded.
If you play at <330 fps this barrel is great with a g&g bucking, even better if you use the g&g flat hopped. They are stupidly hard to get nowadays but they do perform very well