Mounting and installing the FBUIS-B on Picatinny

The FBUIS-B is a matched front-and-rear flip-up iron set from Ozark Armament. The Amazon listing ships a hex screwdriver for the Picatinny clamps. This guide sticks to that hardware and the published specs—no torque-wrench fantasy numbers, no claims beyond the listing.

View FBUIS-B on Amazon

Install steps

1. Clear the rail. Make sure the Picatinny section is free of burs and that you have empty slots where the recoil lugs will drop.
2. Place the rear sight toward the receiver end so you get a full sight radius without blocking charging handles or ejection (platform-dependent).
3. Drop the lug into a slot, then snug the clamp with the included hex driver. Firm is enough—do not round the screw.
4. Place the front sight forward on the handguard or gas-block rail so front and rear heights match when both are flipped up.
5. Cycle the flip mechanism several times. A drop of light oil on the pivot helps if the detent feels stiff out of the box.
6. Confirm fold-flat clearance under your optic before you leave the bench.

After install

• Zero windage and elevation at the range (see a dedicated zeroing guide if you need the click process).
• Re-check clamp screws after the first range session; aluminum holds well, but first-shot settling is normal.

Kit facts (listing)

• Material: aircraft-grade aluminum
• Mount: Picatinny · tools: hex screwdriver included
• Features: spring-loaded flip-up, dual rear apertures, adjustable windage/elevation
• Weight: 3.84 oz (set) · Model/MPN: FBUIS-B · ASIN: B01AISP1KW · UPC: 784672554763
• Lifetime guarantee (Ozark Armament) · Amazon 30-day returns per listing

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