This conversion seems to function flawlessly with any high speed ammunition. I dont like plastic magazines. The magazine came with a chip out of the retaining notch, but it works. The instructions that came with the kit failed to mention that the rear sight was secured with two small allen screws (wrench provided). My rear sight was way off to the left. Luckily I figured out the allen screws before I drifted the sight back to center. Don''t buy this kit to sharpen your skills with the centerfire ammunition/pistol. The aluminum slide/plastic magazine makes it about half a pound lighter and an entirely different pistol. But it is a fun pistol and cheap to shoot. And it is still a Sig.