My installation tip: you can file metal off, but you can't put it back.
The first set I got, was very tight on my 75. I got impatient filing just a tiny bit and test over and over, so I ended up taking too much off. the front sight wiggles fore and aft, but is secured by the roll pin. The rear was so loose that only the set screw was holding it in place and it started drifting around the first time I shot it, so I had to shim it up.
Corollary installation tip: buy or borrow a sight pusher. That universal one from NC Star seems to be, by all reports, perfectly functional and only $40 or so.