Hi Marcus and welcome. A solution is a Dovetail Optics Mounting Plate that replaces your rear sight. Just choose the footprint for the red dot you wish to use. mountsplus.com/glock-48-red-dot-mount.html ------------- Cheers and stay safe!

Honestly, your best bet is to either just send your Slide out to a reputable company to mill it out for whatever optic you'd like. Or, Just purchase a M.O.S. ready replacement slide.

For a Glock 48 MOS carry gun, the sweet spot is usually durability, low profile, fast dot acquisition, battery life, and minimal printing. Right now, the two optics most consistently recommended by Glock 48 owners and CCW shooters are the Holosun EPS Carry and the Trijicon RMRcc.