Checking BUIS zero after optic changes

Changing optic height, ring position, or handguard torque can alter cheek weld and how you see co-witness—even if BUIS clamps never moved. After any optic work, confirm backup zero with live groups, not assumptions.

View FBUIS-B on Amazon

When to re-confirm

• New optic or different mount height
• Optic removed and reinstalled
• Handguard removed (front sight rail may shift)
• Witness marks on windage/elevation dials no longer match

Quick confirm

1. Flip BUIS up; same aperture as your recorded zero.
2. Fire a small group at your BUIS zero distance.
3. Adjust dials only after clamps pass a wiggle test.

FBUIS-B facts

• Model FBUIS-B · aircraft-grade aluminum front & rear flip-up pair
• Picatinny mount · hex screwdriver included
• Spring-loaded · dual rear apertures (precision + CQB) · windage/elevation dials
• Listed set weight 3.84 oz · UPC 784672554763 · ASIN B01AISP1KW
• Seller Ozark Mountain Supplies (FBA) · lifetime guarantee noted on listing

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

Product facts from the public Amazon listing for ASIN B01AISP1KW only. No price guarantees. Never invent torque values.