I have a policy regarding my guns. They need to be user friendly and easily maintained. I need to know that in a worst case scenario I can repair any of them that may need it. This means that I keep spare parts on hand for the guns I have, and I know how to fit and install them. So there are a lot of great guns on the market that I have no interest in using anymore. Guns that use rivets or proprietary roll pins are not suitable for long term use. Why? Because if the guns you own today became the only guns you would ever own, are you capable of keeping them running? When a gunsmith or warranty center is no longer available, can you keep your guns running? In my case the answer is “yes”. Guns that go "Sproing!" when you take them apart may not be the best to have when SHTF. HK policy is that once a roll pin has been removed it should be discarded and replaced with a new one. For someone like me who does periodic detail stripping and cleaning, that policy does not work. Great guns, but not conducive to long term maintenance. Can those roll pins be reused in a pinch? Of course. But for how many uses? Sig Sauer “P” series pistols are famous for shedding grip screws (and having grips fall off). And under the right side grip is a spring that is crucial to the operation of the pistol. But those plastic grips are easily broken, thereby exposing the easily lost spring. The pain truth is that Sigs are fragile and easily taken off line. But they are fairly easy to detail strip. CZ makes some great pistols. World class. But they have lots of small parts, and spare parts are not readily available. A lack of spare parts is not good. CZ’s take a ton of hard use, but when they break they are a pain to repair. Ruger is well known for keeping their spare parts strictly controlled. Good luck finding spare parts for most Rugers. Browning Hi Powers are very easy to maintain and work on. Not all parts fit each version though, so have your spares on hand. Spares are also tough to track down at times. 1911s? They are the interesting pistol. A 1911 is brilliantly designed to be detail stripped with no tools other than the parts of the pistol. They take ton of abuse before parts start failing, usually. But those parts are not typically considered “drop in”. They can require some fitting, so I consider the 1911 a “tinkerers pistol”. Parts quality also varies greatly from one company to the next. But anyone who is even moderately mechanically inclined can keep a 1911 running. Just be aware of issues like non standard firing pins from one maker to the next. SAI uses proprietary firing pins. Know what your gun needs. And beware when using full length guide rods, super tight bushings and hex head grip screws. They can all require extra tools to remove. Glocks are the easiest to maintain. Take down can be done with something as simple as a stiff paperclip, or a nail. As a bonus, all of the spare parts a Glock is likely to ever need can be stored inside the hollow cavity in the grip. And Glock parts require absolutely no fitting at all. The tolerances are kept very tight in the manufacturing process, so all parts interchange. In the revolver world, S&Ws are the easiest to maintain and also the easiest for which to get spare parts. So if your SHTF pistol is your only pistol, make sure you have a rudimentary knowledge of how it works, and how to keep it running. Get the spare parts you may need to keep it running and pre-fit and test them while they are available. And make sure you have a good supply of spare springs no matter what you use. Springs wear out fast. Some countries restrict gun parts like they do guns. Get spares now.