I just completed my 200+ round break in of my CM9. Happy to report, out of 250 rounds, 4 different ammo types/brands, I only had one FTF, which occurred on the 2nd round of Winchester White Box. Has been perfect since that second round. Break in of 200 rounds was WWB. Then I tested Hornady Critical Defense 115g, Winchester "D" 124gr defend ammo, and Federal 124g hydroshock. All performed perfect and were accurate. Now, I just need to decide which ammo to carry. She's ready to go.