The 1911 uses the Browning locking system of course. The tilting barrel with a recoil spring underneath is probably the most common semi-automatic pistol design in use. However, it has been modified over the years. The 1911 had a removable slide bushing, a tilting link and multiple locking lugs on the top of the barrel that lock into matching recesses in the slide forward of the ejection port.
If you keep those design elements and the .45acp cartridge, they become progressively more finicky once your barrel gets shorter than about 4 1/4". You need enough slide travel for the locking lugs to unlock from the slide, the slide to recoil far enough to eject the spent casing and feed a new round, the slide bushing to not impact anything, the barrel be able to tilt to a greater angle because the barrel is shorter, and the rounds to feed properly because the angle into the chamber has steepened.
You can trace the evolution of the mini guns through changes in the length of the slide bushing, to include eliminating it completely and using a bull barrel that indexes directly on the slide, eliminating a locking lug, dual recoil springs, and changes to the chamber mouth and link. These only work so well and you still have to deal with magazine springs because the gun cycles faster. Because the recoil spring is so short, it compresses and unloads very quickly so the range of ammo that has the right burn rate and pressure also narrows. Some bullet shapes will work with the steeper feed angle, some won't. So when you shorten the barrel from 5" to 3.5", your tolerance window for different loads gets smaller.
What I have seen in a lot of the smaller 1911 designs is that they are in 9mm or .380, the chamber portion of the barrel locks in the ejection port like a Glock, etc., no tilting link (camming lug like the Browning HP) and no barrel bushing, recoil spring plug. Essentially, they've made the barrel, recoil spring and lock up as Glock-like as possible while retaining a 1911ish slide look, single stack magazine, and 1911ish fire control.
Shortening the cartridge lets you shorten the slide cycle, as does changing the lockup and no barrel bushing. In principle, you can get pretty small and retain reliability and ammo flexibility (in 9mm and .380). I haven't heard a lot of reliable information on any of the manufacturers. For the most part, most of these guns don't see a lot of shooting. People buy them, stick them in a pocket or drawer and they don't get shot. I haven't seen any testing by the group of YouTube shooters that I consider worthwhile. What I would consider doing if you have them in your area, is go to the ranges that have them as rental guns and talk to them about what they've seen so far as reliability, durability and "shootability". Keep in mind though, they are using their range ammo so the fact that they may run well on those isn't a green light for any ammo. Find out what they use (probably the stuff they get for the lowest cost in bulk) for reference. Go to different ranges because odds are, they aren't using the same ammo. Try to get a feel from their experience. How often do they clean them? Lube? Look at their guns for wear (look for unusual wear). Unfortunately, very few ranges keep accurate records on round counts through individual guns, how often they clean, parts replacement, etc.