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M9s have the older style straight dust covers (bottom front of the frame where most modern pistols' rails are), 2-dot sights instead of the 92FS' 3-dot sights and do not have that groove underneath the beavertail like newer 92FS pistols. Their serial numbers also start with "M9-".
I bought an M9 at a local store in 2009 for $680 and I still use it in IPSC.