A reader, who shall remain anonymous, emailed me this account of what happened to him.
Your message about the 9 mm Nato versus 9 mm Luger (9×19 mm, 9 mm Para) is correct and should be a warning to all users of 9 mm pistols. I found out the the higher pressure of the Nato round can be punishing. The same day as I received my first and brand new police service pistol, the Walther P5, I took it to my shooting club to show it to the lads and to shoot it.
Because I ran out of ammo, I borrowed a box from a military friend, who used 9 mm Nato rounds. After two shots my new pistol jammed, because the extractor broke off. I had some explanation to do the next day in order to get my service gun back in working order and got the message: Never use military ammo in non-military firearms. So, any surplus army ammo: use it in the Browning High-Power or the Glock, but not in “civilian” pistols.