Iron sights work, but most AR-15 owners eventually add an optic. The two big choices are a red dot sight and a low-power variable optic (LPVO). Both are excellent. The right one depends on how you use your rifle.
Red dot sights
A red dot is a non-magnifying sight that projects an aiming point. You keep both eyes open and put the dot on the target.
Strengths:
- Very fast at close range
- Lightweight and compact
- Long battery life on many models, often thousands of hours
- Simple to use under stress
Weaknesses: No magnification, so it’s harder to identify and precisely hit small targets at longer distances. A magnifier on a flip mount can help, at the cost of weight.
Best for: home defense, vehicle carbines and close-range work.
LPVOs
An LPVO is a riflescope that zooms from 1x (true or near-true 1x) to a moderate magnification, commonly 6x, 8x or 10x.
Strengths:
- At 1x, it works much like a red dot for close shots
- Magnification for identifying targets and shooting farther
- Illuminated reticles with holdover marks for distance
Weaknesses: Heavier and bulkier. Eye box at 1x is less forgiving than a red dot. Usually costs more for good quality.
Best for: general-purpose rifles, hunting hogs and coyotes, and multigun.
What competitors use
In multigun, where targets range from a few feet to hundreds of yards, LPVOs dominate. The Tactical Division at USPSA Multigun Nationals, won in 2026 by the Army’s Staff Sgt. Nate Staskiewicz, is largely built around a single magnified optic on the rifle.
Buying advice
- Don’t cheap out on the mount. A quality mount holds zero; a poor one wanders.
- Buy proven brands. An optic that fails when you need it is worse than none.
- Check illumination. Daylight-bright illumination matters for LPVOs.
- Keep backup sights if your rifle is for defense.
Zero and practice
Zero your optic with your chosen ammunition. A 50-yard zero is a popular choice for AR-15s used at typical distances. Then practice from field and defensive positions. The best optic in the world won’t help if you haven’t trained with it.
