I finally got my G23 9mm conversion barrel from Lone Wolf. So far, flawless performance! I used it in my Gen 4 G23, along with a gen 4 G19 recoil spring. I started with Winchester NATO 124 grain, and after seeing that it works just fine, I tried WWB 115 grain ammo and got the same flawless performance. I then tried the barrel in my Gen 4 G27, but I kept the standard G27 recoil spring. Again, no problems at all. The G23 + G19 spring had satisfactory ejections - not overly powerful, but no BTF or FTE issues. Most landed about 3 feet away at 4-5 o'clock. The G27 ejection was noticeably weaker, but still no problems. Most landed about 2 feet away at 5 o'clock. For comparisons sake, WWB 40 S&W ammo typically lands at about 3-4 o'clock and 6 feet away.