As far as GLOCK mags for PCCs go, all the mags for my Vector have been great so far. I've currently got three of the 40rnd Vector mags, the ones with the extension added to them, and one 33rnd GLOCK OEM G17/G18 mags. All of them have been perfectly reliable in the Vector. The few feed issues I have had were nothing to do with the mags from what I could tell, and only happened the first time I shot the Vector practically right out of the box with no lube other than what it left the factory with. No issues since.
As for magnum revolvers: I absolutely love vintage S&W N Frames, ones made before the mid-70s. I personally believe they are some of the finest made revolvers to ever have come out of the US. I know the old Pythons get all the love, but I have to give it to the old N Frames. And even the old Pythons had their issues, like the cylinder going out of time when fed a steady diet of magnum loads, much like the Model 29 with .44 Magnum. The Model 27 of any vintage can eat .357 Magnum all day just fine, as it is basically a product improved 38/44. If you want a Vintage "dash 2" or earlier Model 29 because you want a piece of firearms history built the old way and don't plan to shoot it regularly with full-house magnums, I say get it. Those old Smiths have some of the nicest blued finishes you'll see anywhere and it's a damn shame S&W lost their blueing process in the 70s.
However, if you are looking for a .44 Magnum revolver that you want to shoot all the time with full-goose magnum loads, as others have said, get the Colt Anaconda/Kodiak or Ruger Super Redhawk. The Rugers are well built, if utilitarian tanks. They'll handle .454 Casull and .480 Ruger, so hot .44 Mag is nothing to them. The new Anacondas a much better looking guns and are basically the new Pythons scaled up and beefed up to handle the larger cartridge. When Colt decided to bring back their two most famous Snake Guns they did it right, kept them as true to the originals as they could while also making sure to address some of the known issues with the originals and beefing them both up to eat today's hot magnums and come back for seconds and thirds. With the Anaconda, they lengthened and beefed up the cylinder, so the new Anaconda will handle longer and heavier .44 Magnum loads that the Smith 29 simply can't. I especially believe the Anaconda/Kodiak make much better carry guns than the Model 29.
But if you gotta have the same gun Dirty Harry had, then nothing but a vintage "dash 2" or earlier Model 29 will do. There are some online gun shops specializing in vintage and collectable guns where you can find vintage Model 29s in great condition for a bit more than you'd pay for a new Anaconda. Simpson Ltd. is where I got my vintage Model 57 and they've always done right by me.
