Harleywood reviews the C4 Precision Sight Watch Harleywood review the Ultradyne C4 Precision Sight. Posted in Learn About Sights, Reviews, Video and tagged c4, Iron Sight, Ultradyne, Dual Aperture, Flip-up, Back Up Sights ← C4 Iron Sight Review by The Daily ShooterUltradyne C4 Precision Sight Review by Dustin Ellermann →