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My thoughts, for what little they are worth. The sighting difference is really negligible. Unless you are a target/competition shooter, I wouldn't be too concerned at all. Each number change, up or down, in the rear sight results in a 2" difference at 25 yards. Each number change, up or down, in the front sight results in a 1" difference at 25 yards.
In my opinion, the caliber exchange kit opens the door to some unusual wear patterns on the alloy frames if not properly fitted to the frame. At a minimum, using an exchange kit will lead to wear that is different than that of the original slide. For this reason, I prefer using the conversion barrels in my SIG's. YMMV
In my opinion, the caliber exchange kit opens the door to some unusual wear patterns on the alloy frames if not properly fitted to the frame. At a minimum, using an exchange kit will lead to wear that is different than that of the original slide. For this reason, I prefer using the conversion barrels in my SIG's. YMMV