Man, the 320 is a nightmare to do a full disassembly/reassembly on. The amount of times I've gotten it all back together and something is slightly out of place and the gun don't work is frustrating. I do also need to watch a video every time I do it to make sure I'm not doing something in the wrong order.
Lol, Glock has 4 main parts when field stripping, the 1911 has 6, the 2 extra being the barrel bushing and recoil spring plug, and that's assuming you don't have a bull barrel model without the bushing. It is no more complicated than a Glock when field stripping. I'd say it's less problematic than a Sig 320 though, the amount of times I had people bring one back into the store after they tried to field strip it and put it together wrong, causing the gun to lock up, is concerning. Not saying it's hard to do it right, but the fact that it can so easily be reassembled wrong to the point of rendering the gun inoperable is a problem. You can't reassemble a Glock or 1911 wrong, it just won't go back together.