Ah, the old "one gun", proof positive post. I once asked to look at a S&W 686, brand new, that was sitting in a nice glass display case. I was planning on buying it. I popped open the cylinder, checked it out, looked at the barrel bore, shut the cylinder, and went to cock it. I got half way back, and it locked up. I mean the cylinder quit turning, the hammer quit coming back, and the trigger froze. And none of those three things could be moved, either way. The salesman took it, and he tried some muscle, I had been real gentle. No dice. As he messed with it, several little pieced of machined stainless fell out on the counter. They sent it back to the factory. I don't know what happened to it, because I bought a Ruger Security Six.
For a year or so I was convinced S&Ws were all junk. Then a friend got a new Model 19 and we went shooting and it was a very sweet handling and shooting gun.
Then (when I had an FFL) I ordered a GP100 for a friend. It arrived, it looked great. Single action, everything was fine. Double action, you could not pull the trigger. Before I decided to tinker with it, I called Ruger, and they sent me a replacement, post haste, and a pick-up order for the one that was messed up. The new one was fine, but my buddy never felt quite right about it, and sold it after a year or so.
I got in a Remington Model 7, and the bolt needed Arnold S. to close it. I sent it to Rem and they fixed it in no time. Had had the wrong spring off a Model 700 installed, and the bolt lugs weren't lapped in real good. When it came back it was the absolute smoothest Remington any ever saw.
A buddy sent his Dad's Winchester Model 21 in to get cleaned and checked out after his Dad died. It came back with no fore end. He called them and they apologised. They knew they had an extra forend, but didn't know which gun it went to, and figured the owner would call. He told them the serial number was on it, and they said "Oh yeah!" No foul, they did a great job on the gun anyway.
Back in the 80s I sold a lot of Tauruses, and they had excellent QC, and costs, and they were making serious inroads into the revolver market. I got a Model 82 in, which had a rough trigger, and when it came back it was as good as any I have ever seen. I still have a 431 for personal defense, and I like that gun better than the Smith 24, which I therefore sold.
The point is, I think everyone screws up building guns. The only one I never saw evidence of that with personally, was Colt, and that's pretty much a moot point now, wouldn't you say?
But, I have never had a really bad experience with any manufacturer when it came to fixing one of their guns, whether it was their fault or not. But, I do not have nearly the number of those types of contacts as I once did.
Anything you buy is a crap shoot. My wife got a brand new name brand computer that was DOA at the house, not too long ago. People die from eating at the hamburger joint.