My 1948 FN, which wears a Buehler (spelling?) bridge mount only has one hole in the bridge, so I assume it was d&t'd by whoever put it together. On at least one of the M50s I've had, I had to file the rear Weaver base for bolt clearance, possibly because I bought the wrong one; who knows?
I really like the looks of the original wing safeties and think they are great on an iron-sighted rifle, but are a little awkward with a scope, but still better than the Buehler on the right side.
If I were replacing an M50 trigger and had the bucks, I'd use the Alaska Arms M70 type, otherwise a Timney I guess.
All these old FNs are great buys and make most of the new stuff look like crapola by comparison.
