Build Box Bonus: Understanding ‘Dwell Time’ | Gun Talk Media
This video explains the concept of 'dwell time' in direct impingement (DI) AR-style rifles. Dwell time is defined as the duration from when a bullet passes the gas port until it exits the barrel. This duration directly influences the amount of gas pressure built up, which in turn affects the cycling of the rifle. Understanding dwell time is crucial for tuning a rifle's gas system, especially when using suppressors, which can significantly increase back pressure and lead to overgassing.













