Here's something a little different. It's a WE 3.9 1911 frame with a WE MEU slide with its guts, and some gubbins from it too.
It's got a TM hop up unit along with a KM rubber. I know about the front end, I'm planning on replacing it anyway. Couple of notes about this...
1. Everything inside and including the TM 4.3 slide swaps over. However, the gun shoots about 1 inch low, meaning that the inner barrel sits at a downward angle inside the outer barrel, which in turn means that the entire hop up assembly is getting pushed up inside the gun. This leads me to believe everything inside a TM Hi-Capa slide sits slightly lower than the WE counterpart. The TM slide is also a REALLY tight fit. Cycles fine, but needs some lube to run smoothly.
2. WE 1911 slide works perfectly fine, no accuracy issues.
3. 4.3 length inner barrels don't work in the WE 1911 5 inch outer barrels. A shorter inner barrel points WAY off, so the shot goes high right.
4. Every so often, the slide occasionally binds. Racking it solves the problem. Happens only when racking manually, not during firing. Not sure what's going on here.
5. The dust cover (the portion of the frame in front of the trigger guard) is actually Government length, not Officer length. You can use either the 5 inch slide, 4.3 inch slide, or the 3.9 inch without any problems.
Also forgot to add...interestingly enough, this gun actually exists. Well, to be more accurate, a custom gunsmithing company called Cylinder and Slide can actually cut the frame down on a full size 1911 to Officer's length, whilst leaving a full 5 inch slide on the gun. Here's an example (gun is NOT mine, belongs to a forum member called BriGuy1 over on thehighroad forums):