How to Choose a Red Dot for a Pistol
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
Choose a pistol red dot based on dot size, battery life, durability rating, and mounting compatibility. A 3-6 MOA dot works best for most applications, with enclosed designs offering better protection than open emitters.
How This Affects Your Sight Picture
Pistol red dots have become standard equipment for duty, competition, and defensive use, offering faster target acquisition than iron sights. The key is matching the optic's characteristics to your intended use while ensuring proper mounting and co-witnessing with backup sights. Different applications require different compromises between dot size, battery life, and durability.
The Detail
Dot size is your first major decision. Smaller dots around 1-2 MOA provide precision for longer shots but can be harder to acquire quickly under stress. Larger dots in the 6-8 MOA range are fast to pick up but can obscure small targets. Most shooters find 3-4 MOA hits the sweet spot for general defensive and competition use, providing good precision without sacrificing acquisition speed.
Battery life varies dramatically between designs. Always-on optics with motion activation typically run 6 months to several years on a single battery, while manual activation models may last even longer but require you to remember to turn them on. Solar backup systems can extend runtime indefinitely in good light conditions. Consider your maintenance habits and how often you'll actually change batteries when evaluating claimed battery life.
Durability separates serious optics from range toys. Look for models that have passed military drop tests or have established reputations in competition and duty use. Enclosed emitter designs protect the LED from impacts and fouling better than open emitters, though they add bulk. Water resistance ratings matter if you'll be using the pistol in adverse conditions.
Mounting systems must match your slide preparation. Some optics use proprietary footprints while others follow standardized patterns. Direct milling provides the lowest profile but limits your options, while adapter plates add height but increase compatibility. Window size affects your field of view and how forgiving the optic is to slight head position changes.
Consider whether you want co-witnessing iron sights. Lower third co-witness keeps your irons visible in the bottom of the window, while absolute co-witness places them at the same level as your dot. Some shooters prefer suppressor-height sights that clear the optic body entirely, giving you a true backup if the red dot fails.
Build Impact
Your slide machining or adapter plate choice will determine which optics you can mount, so decide on the red dot before cutting. Factor in the total height over bore when selecting backup iron sights to ensure they'll co-witness properly with your chosen optic.