I've seen more than one cluster-F with Sako/M16 extractor conversions. I just don't get it. Spend money to "fix" something that isn't broken. Even when done perfectly, the brass ejection angle is generally changed, making its flight path into the bottom of the scope. Also, I can see no good reason to undercut (weaken) the ejection side lug (how the conversion is generally done). You also make your firearm less saleable on the used market.
I think the best thing to do is keep the standard 700 bolt face/toenail ejector clean, oiled, and free of brass. If you're worried about it, carry an extra in your maintenance kit.
