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I bought a LPA rear sight for my 92 and it works well; it looks identical to the one that Beretta sells on their webiste. I paid a gunsmith to install it, so I cannot comment on the ease of installation.
I do not see a difference in accuracy, but my POI has greatly improved. I find the rear notch is a little shallower than the original sight, but not by much. I find it worth putting up with for the fact that I can work with different loads and not have to worry about POI; I guess my accurcay has improved a bit then .