Both Glock 17 9 mm and beretta 92 fs witch are butter because of
their high durability.
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No. The Beretta 92 magazine will function in a PT92 - the PT92
is a Beretta 92 manufactured under license. However, the 9mm 92
magazine will not work for the .40 PT99.
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Yes, but it requires an adapter to do such, and these are a bit
uncommon.