Dang. Taking it back now. Thankfully they just got in someone’s full collection of Soviet cameras so I’m trading it for another FED that I will definitely be testing fully. Thanks for the advice!
You chose well, it's just a shame the FED 2 didn't work out. It's definitely the best model of the post-Leica-copy FED line. I started with a FED 2 myself when I was a poor student many years ago, and have owned most of the Soviet rangefinders over the years. I only skipped the Zorki 3 and 3M - they're quite pricey for what they are.
If you want a recommendation and you can't get a FED 2 that works, an early "stepped top" FED 3 is a nice (if quirky-looking) choice, but the "flat top" FED 3 gives you a lever wind, and is still very useable. I'd skip the 4 - the rewind is a pain in the ass. And the FED 5 has its charms but is huge and feels noticeably cheaper (and has an endemic light leak problem that is easily remedied). Don't let that put you off, though. I'd still take a FED 5 over a lot of other cameras at the right price.
If they have Zorkis, I recommend the 5 or 6. The 5 is a bottom-loader which makes it a bit smaller and more solid, but some people absolutely hate bottom loading. The 6 is a swing-back like a typical SLR. I prefer the 5, but the 6 is basically the same. Either are better than the larger 4 or 4K which often have issues due to the slow speed mechanism.
Also, you can't go wrong with a FED 1 or a Zorki 1, of course. They're more or less direct copies of the Leica II - very solid and reliable cameras, and incredibly fun to use. If I was starting over, I'd just go straight for these. I much prefer the separate RF/VF setups now over the combined ones. They're much easier to focus with.