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Hi Claude and welcome. The M18X has a compact slide on the compact frame but has a full-sized grip as well. The current difference is the Optics. Cheers and stay safe! https://www.youtube.com/watch?v=3G5zoqgBoeQ

there are a few differences 1 said you said the optics 2 the X series has the Flat trigger 3 21 round mags (M18 has 1 17 and 2 21 round mags ) Full size grip module https://www.sigsauer.com/m18x.html

Hi Claude, the M18X is an upgraded version of the M18. The M18X includes a factory mounted ROMEO-M17 red dot optic. The more compact M18X adds an X-Series coyote tan grip module with extended beavertail, aggressive grip stippling and deeper undercuts for greater control. The grip module is also fitted with a magwell extension to aid in rapid mag changes. Added to this is an X-Series flat-blade trigger. Ships with (3) 21rd magazines. . Stay safe & have a great day!

Nor much more to add than what Ed mentioned below. Enjoy if you purchase!!