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Pros: Wide field of view, fast target acquisition, low weight. Trade-offs: Emitter is more exposed to rain/dust/impacts; use quality housings/covers.

Pros: Better protection of the diode and lens from weather, mud, and bumps. Trade-offs: Slightly smaller window and a bit more mass. Ideal for duty/rugged use.

Absolute co-witness: Iron sights sit in the middle of the optic window. Lower 1/3 co-witness: Irons appear in the lower third of the window; less visual clutter. Co-witness is influenced by mount/plate height and sight height—decide before you buy.

2–3 MOA: Better for precision/range. 4–6 MOA: Faster for close-in targets and defensive use. Small dots favor precision; larger dots favor speed.

Common cells: CR1632 (many micros) and CR2032 (larger windows). Auto-wake / shake-awake conserves power and is great for carry/duty.

Use manufacturer-specified torque; over-torque strips threads. Use the threadlocker grade your plate/optic maker recommends (often medium strength). Keep the emitter and lens clean; a cotton swab and proper lens cloth work well.

Q: Will rain kill an open emitter? A: Not necessarily, but drops can occlude the emitter or lens; enclosed designs resist this better.