Slide cut and optic footprint are not the same thing — and getting them mixed up is the single biggest mistake we see at checkout. A footprint is the mounting pattern on the bottom of an optic. A slide cut is the milled recess on top of the slide that has to match it. If the screw holes and recoil lugs don't line up, the optic doesn't sit flat, and nothing you torque it t …
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The Glock 43X and Glock 48 MOS pistols only accept RMSc-footprint optics, which makes the optic-selection problem narrower and cleaner than full-size Glock work. This isn't a 50-option category like the Glock 17 or Glock 19 lineup — there are maybe a dozen RMSc-pattern optics worth considering, and the right pick comes down to glass quality, dot crispness, battery life, a …
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Optic footprint mismatches drive more red-dot returns than any other slide question. The cut on your slide and the bolt pattern on your optic have to match — and the terminology is confusing because "RMR cut," "RMSc cut," and "Holosun K" refer to bolt patterns that are not interchangeable. This guide maps each footprint to the Glock platforms 3CR cuts slides for, explains …
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