AR15 Sights

AR-15 Iron Sights Overview

AR-15 iron sights consist of a front sight post and rear aperture that align to create a sight picture for aiming the rifle without electronic optics. Iron sights serve as primary sighting systems on rifles without optics and as Backup Iron Sights (BUIS) on rifles equipped with red dots, holographic sights, or magnified optics. AR-15 iron sights mount to Picatinny (MIL-STD-1913) rail on the upper receiver and handguard.

TactaBlue stocks AR-15 iron sights from Magpul, Troy Industries, Midwest Industries, Daniel Defense, Knights Armament Company (KAC), and Aero Precision in flip-up, fixed, and offset configurations.

Types of AR-15 Iron Sights

AR-15 iron sights are available in 4 configurations: flip-up, fixed, offset, and carry handle. Each configuration serves different operational needs and co-witness requirements.

Flip-Up Iron Sights

Flip-up iron sights fold flat against the rail when not in use and deploy to the upright position with a spring-loaded button or manual lift. Flip-up sights maintain a low profile of 0.25-0.50 inches (6.4-12.7 mm) above the rail in the folded position, which prevents interference with magnified optics and holographic sights. The Magpul MBUS (Magpul Back-Up Sight) is the most widely used polymer flip-up sight set, weighing 1.3 oz (36.9 g) for the front and 1.5 oz (42.5 g) for the rear.

The Magpul MBUS Pro uses steel construction with a melonite finish and weighs 1.4 oz (39.7 g) front and 1.9 oz (53.9 g) rear. Troy Industries BattleSights use hardened aluminum with a steel aperture insert and feature tool-free windage and elevation adjustments. The Magpul MBUS 3 is the latest generation, featuring an updated deployment mechanism and refined sight picture.

Fixed Iron Sights

Fixed iron sights mount permanently in the upright position and provide the strongest and fastest-deploying backup sighting solution because fixed sights require no activation mechanism. The Daniel Defense Fixed Front and Rear Sight Set uses 6061-T6 aluminum construction and mounts directly to Picatinny rail. Fixed sights add 1.0-1.4 inches (25.4-35.6 mm) of height above the rail and may interfere with some magnified optic mounting positions.

The A2 front sight base is a fixed sight integrated into the gas block assembly on many factory AR-15 rifles. The A2 front sight post adjusts for elevation using a sight adjustment tool. The A2 front sight base height is 1.495 inches (38.0 mm) above the rail centerline.

Offset Iron Sights

Offset iron sights mount at a 45-degree angle to the primary sighting plane, allowing the shooter to transition from a magnified optic to iron sights by rotating the rifle 45 degrees. Offset sights are used in 3-gun competition and tactical applications where rapid transitions between close-range and long-range engagements are required. The Magpul MBUS Pro Offset mounts at 45 degrees and provides a separate aiming point without interfering with the primary optic. Offset sights add 0.8-1.5 oz (22.7-42.5 g) of weight to the rifle.

Carry Handle Sights

Carry handle sights replicate the original M16A1/A2 sighting system with an integrated carrying handle and rear aperture. The carry handle mounts to the Picatinny rail on flat-top upper receivers and provides dual apertures: a small aperture (peep sight) for precision shooting at distances beyond 200 yards (183 m) and a large aperture for close-range rapid acquisition. Carry handle sights add 2.5 inches (63.5 mm) of height above the upper receiver.

Iron Sight Features and Adjustments

AR-15 iron sights provide 2 types of adjustment: windage (horizontal) and elevation (vertical). Windage adjustments move the point of impact left or right. Elevation adjustments move the point of impact up or down.

Windage and Elevation Adjustments

Rear sight windage adjustments use a knob or screw that moves the rear aperture laterally. Most AR-15 rear sights provide 0.5-1.0 MOA per click of windage adjustment, which equals 0.5-1.0 inches (12.7-25.4 mm) of point-of-impact shift at 100 yards (91.4 m). Front sight elevation adjustments use a threaded front sight post that screws up or down with a sight adjustment tool. Each rotation of the A2 front sight post moves the point of impact approximately 1.3 MOA.

Dual Aperture Rear Sights

Most AR-15 rear sights feature 2 aperture sizes. The small aperture (1.8-2.0 mm diameter) provides precise aiming for shots at 200-600 yards (183-549 m). The large aperture (4.5-5.0 mm diameter) provides rapid target acquisition at distances under 200 yards. The shooter switches between apertures by flipping or rotating the aperture drum.

Co-Witness with Optics

Co-witness describes the relationship between iron sights and a mounted optic when both are visible in the shooter's field of view. Absolute co-witness places the iron sights centered in the optic's viewing window using a standard-height optic mount. Lower 1/3 co-witness places the iron sights in the lower third of the optic window using a taller optic mount, which provides an unobstructed optic view with iron sights visible below. Lower 1/3 co-witness requires optic mounts with a centerline height of 1.57 inches (39.9 mm) or higher above the rail.

How to Zero AR-15 Iron Sights

To zero AR-15 iron sights, fire a 3-round group at 25 yards (22.9 m) and adjust the sights to move the point of impact to the point of aim. A 25-yard zero corresponds to a secondary zero at approximately 300 yards (274 m) for 5.56 NATO M855 ammunition because of the bullet's ballistic trajectory.

Move the rear sight in the direction you want the point of impact to move. Move the front sight in the opposite direction of the desired point-of-impact shift. To move the point of impact right, adjust the rear windage knob to move the aperture right. To move the point of impact down, screw the front sight post upward (raising the front post lowers the point of impact).

Confirm the zero at 100 yards (91.4 m) after the initial 25-yard zero. A properly zeroed AR-15 with iron sights maintains a point-of-impact deviation of less than 2 inches (50.8 mm) from 0 to 300 yards with standard-velocity 5.56 NATO ammunition.

Shop AR-15 Iron Sights at TactaBlue

TactaBlue (tactablue.com) stocks AR-15 iron sights from Magpul, Troy Industries, Daniel Defense, Midwest Industries, Knights Armament, and Aero Precision. Pair iron sights with an AR-15 handguard that provides Picatinny rail at the 12 o'clock position for rear sight mounting. Browse the full selection of AR-15 accessories including LPVO scopes for primary optic options. All iron sights sold at TactaBlue are authentic, factory-sealed products from authorized distributors.

TactaBlue ships within one business day and offers free ground shipping on all contiguous U.S. orders. A 30-day return policy applies to eligible items. For questions, contact support@tactablue.com, Monday through Friday, 10 AM to 6 PM ET.