It cycles fine. Every pistol that has a threaded barrel essentially just has a longer barrel, and no other adjustments are required when you add a threaded barrel, right? So adding this barrel should work 100% eh? I think the 9C is 3.5" and the 9 is 4.25", so that would be a 3/4" difference (perfect to add a 1/2x28 thread). Even if I don't thread the barrel, I may still carry my 9c with the longer barrel for increased accuracy.