I have a regular u22 neos with the 4" barrel, I've found the thing works pretty well. I bought it maybe 2 years after they came out and feed it the 550 rnd block of federal ammo they sell at walmart, works great. When I first got it it did stovepipe maybe 1 out of every 300 rounds, but it has since stopped that. I've also tried a brick of remington and some cci minimags and they've all worked pretty well. I think there are more reliable ones out there but I've had pretty good luck with mine. When I bring it out in front of my friends they all huddle around asking about it.
