Riffraff & Pistolnut:
I have to respond to both of your posts on this thread.
First, I don't consider myself an expert on firearms. But I am an expert mechanical engineer (retired) with extensive experience in machine design and manufacturing.
1070 rounds in 24 months works out to an average of 44+ rounds per month. That is not enough shooting to maintain proficiency, so I usually take three guns to a range session. One of them is always my Ruger Mk II. Cheap to shoot, counteracts the flinch that I develop after shooting a lot of high power stuff.
I would estimate my R9S would have had less than 500 rounds thru it after 24 months in service if it had been 99% reliable. It wasn't, so carrying it was a stretch for my own "carry piece rules".
Other shooters probably would make a change (ammo type, recoil spring, mag spring, etc.) shoot a mag or two successfully, and put the pup back in their pocket.
But not me. I'm cursed with a life's experience of validating engine designs and changes before approving them for volume production. I got pretty good at statistically evaluating processes and parts. You have to get proficient when you're making tens of thousands or hundreds of thousands of engines per year.
But - statistics mean nothing when it comes to your own INDIVIDUAL experience. Either the gadget works or it doesn't. If the gadget is a car, maybe you have to call AAA. If the gadget is your gun (or, even worse, your backup gun) a failure to go bang could mean your life.
So a failure to feed, failure to eject, stovepipe, or double-feed mean I'm back to square one in trusting a carry piece. Some of the gun writers claim you have to run a minimum of 200 rounds of your carry ammo thru a gun with zero failures. Any bobble means you start over again. That's time consuming, expensive, and unrealistic.
I settle for four mags of a given type of ammo (I have 4 mags) thru the gun without a failure as good enough to carry. My "new" old R9S did that easily. It has the newest springs and parts. I'm satisfied.
Karl R. didn't say anything about my gun's history of less than 50 rounds per month being excessive. He did say his personal early serial number gun has about 200 rounds on it. Then he laughed and admitted as to how he gets to shoot a lot of R9 pistols a lot of rounds every day.
He also said he doesn't visit this forum, "My computer is a #2 pencil." A lot of the good manufacturing guys I worked with were like that. Better to be out on the floor with the machines and making parts than to be sitting in front of a computer "wasting time"!
Sorry for the long post but that's the way I see the role and duty cycle of any carry gun.
Steve