Quick Answer
A longer barrel in an AR-15 generally improves accuracy due to reduced muzzle rise and increased time to stabilize the bullet in flight.
Barrel Length and Recoil
A longer barrel reduces the muzzle rise caused by recoil, allowing the rifle to settle back into its original position more quickly. This minimizes the effect of the recoil on the shooter’s aim and can improve overall accuracy. For example, a 20-inch barrel can result in a 25-30% reduction in muzzle rise compared to a 14.5-inch barrel.
Effects on Bullet Stabilization
The increased time available for the bullet to stabilize in flight with a longer barrel also contributes to improved accuracy. A longer barrel allows the bullet to rotate and stabilize more fully, reducing the effects of drag and aerodynamic forces. For AR-15 rifles chambered in .223 Remington or 5.56x45mm, a barrel length of at least 18-20 inches is recommended for optimal accuracy.
Practical Considerations
When choosing a barrel length for deer hunting with an AR-15, consider the specific application and terrain. For example, a longer barrel may be beneficial in dense cover where accuracy is more critical, while a shorter barrel may be more suitable for open terrain where speed and maneuverability are priorities.
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