Compared to other industries the QA of the gun industry - well - leaves a bit to be desired.
I own 8 hand guns and 5 long guns all purchased new. Of those I had catastrophic failures occur in a Bushmaster AR-15, a Taurus Raging Bull and a CZ-75. The BM failed right out of the box. The RB after about 200 rounds and a couple of months and the CZ after about 1000 rounds and about 6 months. All failures were related to bad parts. In the BM the ejector and spring were out of spec. In the CZ the trigger was out of spec and in the Taurus a spring and retaining screw were just poorly designed.
3 out of 13 is a 23% failure rate. The odds of a single individual experiencing a 23% failure rate if the gun industry is doing a good job (say real failure rate is <1%) are pretty darn slim.
For example in the last 27 years I've never been without a computer. In that time only 1 has failed and it was 3 years old. If computers had a 23% failure rate within the first 6 months I wonder how many people would be computing today. The same goes for my cars only better. None has ever failed in any way in less than 5 years with one exception. Since I bought my first car in 1974 I've only experience one catastrophic failure (rotten ass lousy British made MG Midget - POS right out of the box - it never worked right - the carburetor even caught on fire once).
Back in the late 80's and early 90's I ran a manufacturing department that made kidney dialysis machines and blood diagnostic devices. Our QA procedures gave us a failure rate of less than 1 in a 1000 and that was at the factory - in the field the failure rate was an MTBF of well over 2 years of 24/7 operation. I'm here to tell ya that that equipment was exponentially more complex than the most complex gun ever built with hundreds of more parts which included pumps, optics, motors, electronics etc.
If we could keep failures to less than 1 in a thousand then so can the gun industry. It isn't really that hard. All it takes (assuming good design) is process control, trained machine operators, trained assemblers and a work force that makes quality the prime directive. In the long run a company saves money and increases sales with good QC. We took a $250,000/month warranty expense and after implementing our QA plan over a period of three years turned that into a $50,000/month warranty expense and increased sales by 25%.
But what is one to do. The gun industry is small. I read that less than 20,000 are employed in it in the USA. And they're the only game in town because folks with money aren't jumping on the bandwagon to start up new firearms manufacturing facilities.
It boils down to we're a captive audience with nowhere else to turn. Oh well - at least the industy's poor quality record provides employment for a bunch of gunsmith's.