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Charles, FS = Fixed Sights Sir. (Glock 26 GEN 5, Semi-automatic Pistol, Safe Action, Sub Compact, 9MM, 3.42" Marksman Barrel, Polymer Frame, Matte Finish, Fixed Sights, 10Rd, 3 Orange Follower Magazines, Glock OEM Rail, Ambidextrous Slide Stop Lever, Flared Mag Well, nDLC Finished Slide and Barrel, No Finger Grooves 10Rd, 3 Mags, Glock OEM Rail, Fixed Sights, Made in USA)

FS=Fixed sights

Charles, for all the misinformation that comes from BUDs community members attempts at being accurate. No "fixed sights" with Glock. Rear is always dovetailed in to drift for wind-age. "FS" means factory sights. They are polymer and post front with dot and goal post rear.

https://www.atlantictactical.com/glock-26-gen5-9mm-handgun-with-fixed-sights-pa2650202/

Per Glock web page (FS) is front serration https://eu.glock.com/en/products/glock-options/front-serrations