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It looks like it stands for "Front" but they didn't put the rest in should have been "front serrations" for the cocking serrations at the front if the slide. Had me excited for a second I was thinking how cool would it be if they had a glock with a forced reset trigger? But nope just the serrations.

Milton, this model has FSS - Front (FRT) Side Serrations Sir. Pictured : https://www.topgunsupply.com/glock-19-gen-4-front-serrations-9mm-used.html

Frt means front serrations. Hope this helps.

Milton, front serrations. Have a great day sir!