AR-15 Optics Guide: Red Dot, Prism, LPVO and Iron Sights

The right optic shapes how your AR-15 handles. Match it to how and where you shoot.

Red Dot Sights

Red dots are fast, light and simple. They work with both eyes open and have unlimited eye relief. Pick an enclosed emitter model if you shoot in dust or rain. They suit close and medium range.

Prism Sights

Prism sights add fixed magnification, often 1x to 5x, with an etched reticle that stays visible if the battery dies. They are compact and tough.

LPVO Scopes

A low power variable optic runs from 1x to 6x or 1x to 8x. It works like a red dot up close and gives magnification at distance. It costs more and weighs more.

Magnifiers

A flip to side magnifier behind a red dot adds magnification without changing your sight.

Iron Sights

Backup iron sights are a good idea on any rifle. Folding models stay out of the way when an optic is mounted.

Mounts

Match the mount height to your optic. Most AR-15 red dots use a lower one third or absolute co-witness height. Confirm a mount fits your optic footprint before buying.

Zeroing and Co-Witness

A 50 yard zero is a popular choice for a red dot on a 5.56 AR. It keeps hits close to the dot out to 200 yards. A backup sight co-witnessed with the dot can help if the optic fails.

Battery and Weather

Look for long battery life and a motion sensing on switch. Keep a spare battery in your range bag. Optics rated waterproof and shockproof hold up better to heat, rain and recoil. Always test a new optic at the range before relying on it.

Browse scopes, sights and optics or check our 5.56 AR build guide.