My son used an M-9 very effectively in Iraq in 2003. He found that if it was kept clean and he used genuine Beretta magazines, it worked. He killed two men with it, and said that the 9mm stops better than some would have us believe. One Iraqi scrabbled around on the floor for less than a minute (while a medic ran up and tried to treat him!) but died without being able to take hostile action after being hit in about the solar plexus witrh two 9mm bullets. This was across a room, and the man had been carrying a Dragunov sniper rifle, with which he had been firing on US troops.
It is very important to understand that the US military has not purchased the revised, improved locking blocks for the pistols. Newer commercial guns come with these, and they last far better than does the original design. I understand that the .45 project is cancelled and that more M-9's have been ordered. Presumably, these will have the new locking blocks, and should fare better than the older pistols.
LAPD and LA Sheriffs deputies do issue the M-92F and seem pleased, save for some who don't like the caliber. I have also talked with an officer in Texas who likes his 92F just fine, and says that it has given no trouble. A number of other departments across the US use the gun, and it seems not to give the problems that early ones did in military service. Also, the steel composition was changed to eliminate tellurium, an elment that made slides brittle.
My son has left the Army, but does own a personal M-92F and it works fine, although he prefers the Browning 9mm Hi-Power, partly for sentimental reasons, and because it fits his hand better. I prefer the CZ-75B.But all will do the job.
Lone Star