I bought my G23 Gen4 with the idea in mind to convert over to 9mm once I had more money saved up. I have been pricing out ammo and buying 1000 rounds of 9mm compared to .40 i will save about 67 bucks. I plan on shooting atleast a 1000 rounds every month. I believe I will be ordering the 9mm converision barrel from lone wolf this friday along with 3 9mm mags. I have read they have about a 1 percent failure rate to feed with cycling on cheaper 115 grain ammo. The suggested way to fix is use box of good high power ammo and if that doesnt fix it drop the recoil spring down to 11lbs. For those of you who use a converision barrel have you had any issues and have you changed out your recoil spring? Im just wondering because if im most likely going to have this problem i want to order the recoil spring and guide rod right away. Also what brand do you suggest for the guide rod and spring? I would like a good guide rod that the spring can be changed out on also. thanks for your time.