Daily Defense 3-33: "Mechanical Offset" for Your AR-15
This video explains the concept of "mechanical offset" in relation to AR-15 rifles and similar firearms. Mechanical offset, also known as height over bore, is the distance between the center of the optic's objective lens and the bore of the rifle. The presenter details how this offset significantly impacts accuracy at close ranges, particularly when shooting at small targets. For a typical AR-15 with a red dot sight, the height over bore is often around 2.5 inches. The video demonstrates that at distances of 10 yards or closer, failing to account for mechanical offset can lead to misses. It provides practical advice on how to adjust aiming points, especially when shooting from cover, and recommends range practice to understand and compensate for this effect.








