An RMR-cut slide for a Glock 17 or Glock 19 will accept dozens of different optics, and the price spread between the cheapest and the most expensive runs past ten to one. That range is the actual problem: nothing on the shelf is obviously wrong, and the things that separate an entry-tier dot from a duty-grade one — housing rigidity, dot crispness under recoil, how the ele …
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