Broz, I can't believe i'm actually able to offer YOU advice!
My experience with the Sako (bad) is with my Lazzeroni Patriot. It was a failure to eject, extraction was perfect but the spent case would usually just fall back into the action as if it hit the wall of the ejection port. So, 'smith A decides to modify the ejection port thinking the case mouth was contacting the front of the port (after I told him it didn't) & as you can imagine it didn't help. I finally get hooked up with my current 'smith who thinks maybe the plunger isn't kicking the brass enough (Lazz SA brass very heavy) to throw it clear of the ejection port. After modifying the plunger some, it still doesn't run 100%, so back in it goes... Chad (Dixon) finally discovers the extractor in design is causing a binding action on the rim of the case, after putting a small chamfer on the ends of the extractor, we now have 100% function, as we should.
Now, lets talk installation. I'm sure you've seen the install video posted here, myself being a safety professional by trade, I get somewhat anal when the "what if's" come into play. When installed, there is NOTHING holding the Sako extractor in place other than friction... NOTHING. In the very small chance of a catastrophic case rupture, that bad boy is free to go pretty much anywhere it wants. With my luck, that would be straight down the lug raceway into my face...
The M-16 extractors are cross pinned into place, it isn't much, but it is 100% more than the Sako has.
Can it happen? Yup, already has... Will it happen? probably not, but I'm not a particularly good gambler.