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The design of the slide lock has changed slightly, the rail on the frame is not full length on the M17, and the M17 also has the slide milling for optics with a black cover plate on it.

Brayden, no Sir. Same core frame/slide. the SIG SAUER M17 was awarded the Modular Handgun System (MHS) contract for the U.S. Army. The M17 is a P320-based platform, and was selected for its uniquely innovative modularity, uncompromising performance, and unmatched capability. The P320-M17 closely follows the specifications of the U.S. Army's M17. ---- https://www.sigsauer.com/store/p320-m17.html

very slight differences in some parts most of the military changes have now been incorporated in the p320

Brayden, Same gun