Holosun 507K

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My opinion - The Holosun 507K is the smallest red dot Holosun offers - both in footprint and window size. It's the same 1" width as the Ruger Mark I/II/III/IV upper so it looks really nice and proportional once installed. Buy this if you want the most compact and lightweight red dot.

The Holosun 507K is a micro pistol red dot sight from Holosun with an M.R.S. (multi reticle system) and a modified RMSc footprint (aka the K Series footprint). The MRS reticle gives you a 32 MOA outer ring, and a 2 MOA center dot. The larger outer ring makes “finding the dot” a bit easier, and the 2 MOA dot makes precision shots easier to achieve.

This micro pistol optic is designed to fit smaller handguns such as micro compact and subcompact pistols. It will fit on a K series slide directly (like on the Sig P365) but will require an adapter plate to fit on RMSc slides (like the Glock 43X MOS).

The MRS reticle is also configurable, allowing you to use just the 32 MOA circle, or just the 2 MOA dot if you please.

This durable red dot sight is one of the most popular red dot sights Holosun produces. It features a 7075 T6 Aluminum housing, sleek low profile design, side removable battery, shake awake, manual brightness mode, IP67 waterproof rating, 2 nightvision modes, and long battery life ranging from 20,000 to 50,000 hours depending on the reticle and brightness level.