Smyth Busters: Is a Tight AR-15 an Accurate AR-15?
This video debunks the myth that a tight upper-to-lower receiver fit is crucial for AR-15 mechanical accuracy. While a loose fit can affect function, the barrel, bolt, and optic are all housed in the upper receiver. Therefore, the lower receiver's fit does not impact the bullet's path relative to the sights. A tight fit may enhance shooter confidence and follow-up shot speed but doesn't improve inherent accuracy.









