I went to the range this week and shot 171 rounds if 9mm through the M9. Federal HST 147 grain 16 rounds, Winchester NATO 150 rounds, and 5 left over rounds that I have accumulated through the years. Function was 100%. I know this pistol is no where close for concealed carry for most folks due to its size, but of all the 9s I have, I shoot this one the best. Only upgrade was to install the D-spring on the trigger. I used the standard 15 round Beretta magazines. I really like this pistol.