most will fit
I have a LNIB Max-1 made in 2005. It appears unfired, and I haven't had desire to do so. I have tried a Ciener slide on it, and it worked fine. I see no reason that a 1911 slide would not work if you pull the firing pin block rod first. If you don't the slide gets jammed on there and will have you scratching your head and cursing (don't ask). Hint: release the grip safety.
Barrels are essentially the same, but probably took more hand-fitting. I'd be surprised if an open-minded gunsmith could not fit a barrel. I know the bushings will fit.
I also have a MiniMax 45 made in 2003. Save for barrel and slide length, and recoil guide/spring/ etc it's the same gun as the Max-1. I bought it non-working as a project, so I have swapped out a lot of parts. Here's the short version:
1 - grips are unique. the holes are further apart. Pachmayer used to make a wrap-around finger groove gripset, but it's long discontinued. If you find one, buy it!
2 - Plunger tube is attached by screws rather than staked. plungers & Spring are 1911 parts.
3 - Has a firing pin block that probably is different from that on a series 80 Colt, I don't know. It works fine, or it's easy to disable.
4 - Extractor is external, but then so are kimbers and a few others that are considered 1911s
5 - Mag release is slightly smaller on the left side on mine, easily enlarged to fit. The internal spring and catch work fine. I changed mine.
5 - Mainspring housing retention pin (lower rear of grip frame) is threaded , as is the MSH. You can make a Colt MSH work easily if you want to.
Everything else should work fine, with no more fitting than a Colt might require. For example, I've just changed out the MiniMax with parts from my spares box:
- Wilson sear
- RIA hammer
- Wilson 3-hole trigger (required fitting, blade thickness was oversize)
- generic pin kit.
- Generic thumb safety.
- Generic slide stop.
Works great, trigger pull is better.
I'll be trying a Wilson drop-in beavertail soon, if they make it in officer's size. I expect it will work fine. The non-drop-in variety require radiusing, so should work fine if you are going to have to do that anyway.
So go for it.