Originally Posted by TROOPER

Aaahhh good question... this is where it gets cloudy and complicated LOL.

OK the difference between the 92 and the M9 is one is the civilian version (92) and one is the Military version (M9)

The main difference there between the 92 and M9 are the roll markings on the side of the gun.

The 92 says "Read the owners manual" LMAO.

And I beleive the 92 comes with a plastic guide rod, and the M9 has a steel guide rod. (and the rail as you mentioned)

Now the new "M9A1" model, also has a new internal buffer to reduce recoil, and the take-down lever also swings back into place on its own, when you place the slide back on and rack it.

The M9A1 also has the new and improved Italain made magazines that have a better coating to prevent issues with dirt/grit/sand, as experianced during Afghanistan/Iraq.