Aluminum flip-up BUIS on a Picatinny rail

Polymer backup sights save a few ounces. Aluminum ones trade that for rigidity under clamp torque and recoil. Ozark Armament’s FBUIS-B is the metal route: a matched front-and-rear flip-up set cut from aircraft-grade aluminum, spring-loaded, and clamped to standard Picatinny.

View FBUIS-B on Amazon

What changes with metal

• Clamp faces that don’t crush as easily when you seat the recoil lug.
• Windage and elevation dials that stay crisp after zeroing.
• A rear sight that toggles between a precision aperture and a faster CQB aperture.
• Fold-flat profile so the set co-witnesses with many red-dots when up, and stays out of the window when folded.

Listing facts (ASIN B01AISP1KW)

Mount checklist

1. Pick rail slots so front and rear heights match your optic plan.
2. Drop the lug into a slot; tighten with the included hex driver—firm, not stripped.
3. Flip up, confirm co-witness, then zero.
4. Work the detent a few times; a drop of light oil on the pivot helps if travel feels stiff out of the box.

Ozark Armament is a U.S. company and backs these sights with a no-B.S. lifetime guarantee.

Buy Ozark Armament Flip Up Iron Sights (FBUIS-B) on Amazon

Specs from the public Amazon listing. Published by Ozark Armament.

More guides

• Co-witness flip-up BUIS with a red-dot
• Mounting and installing FBUIS-B on Picatinny

AR-15 iron sights guides

• AR-15 iron sight height and co-witness
• AR-15 front sight post basics
• Iron sights for carbine / home-defense range use
• Range-day maintenance check
• Offset 45° vs inline backup sights
• Iron sight picture and alignment
• Troubleshooting a loose/shifting BUIS

BUIS guides

• BUIS and night vision setups
• BUIS on pistol-caliber carbines
• BUIS on competition rifles (rules overview)
• Install torque / Loctite basics
• Checking BUIS zero after optic changes
• Why matched front/rear BUIS sets matter
• BUIS as primary vs backup role

Double-down indexes (static)

• Flip-up sights
• Iron sights
• BUIS
• AR-15 iron sights