The UTG Accu-Sync AR-15 Flip-Up Rear Sight is a spring-loaded backup iron sight (BUIS) for flat-top AR-15 uppers. It folds down out of the way of your optic and deploys at the push of a button when you need irons.

The Posi-lock push button deploys the sight tower automatically and locks it upright so it won't collapse while you're using it. A dual aperture gives you a larger hole for close, fast shooting and a smaller one for more precise shots at distance, and the windage wheel adjusts without tools. The sight is CNC machined from 6061-T6 aluminum and steel with a matte black anodized finish.

Features:

• Flip-up rear backup iron sight for flat-top AR-15s
• Posi-lock push-button auto-deploy that locks the tower upright
• Dual aperture for close and longer-range use
• Tool-free windage adjustment wheel
• CNC-machined 6061-T6 aluminum and steel
• Matte black anodized finish
• Single locking Torx screw with square recoil stops, 35 in-lb torque

Fit check: this sight mounts on MIL-STD-1913 Picatinny rails only. It does not fit Weaver rails or carry-handle uppers. Pair it with a front sight of matching height and confirm it clears your optic when folded.

Torque the screw to 35 in-lb and zero the irons with your front sight before you rely on them.