I've had a 1911 Ronin 5" in .45 for a couple of years and love it. I recently picked up a 1911 Ronin 4.25" in 9mm ( just to add a 9 to the stable). Took them both to the range this week and I have nothing negative to report about either. Shot flawlessly, on point, and were 1911 right. It was kind of interesting noting the recoil difference between the 5" .45 vs the 4.25" 9mm. I know this is kind of 'duh', (I'm a .45 guy) but the 9 has significantly less recoil than the .45, even though that's a heavier, longer gun. I have avoided 9mm until now, but I think there's a place in my collection.