Firearm Freedom C4 Sight / Apollo Max Review Watch Firearm Freedom review the C4 Sight and Apollo Max, both by Ultradyne. Posted in Learn About Sights, Learn About Compensators, Reviews, Video and tagged apollo, compensator, c4, Muzzle Brake, Ultradyne, Apollo Max, Muzzle Device ← Apollo S vs SJC Titan by Kataboy32. King of the Muzzle Brakes!The Truth About Guns: Ultradyne C4 Sights “Probably the best iron sights on the market” →