Direct impingement
Type of gas operation for a firearm
Direct impingement
Direct impingement is a type of gas operation for a firearm that utilizes gas from a fired cartridge to impart force on the bolt carrier or slide assembly to cycle the action. Firearms using direct impingement are theoretically lighter, more accurate, and less expensive than firearms using cleaner and cooler gas piston systems.
Read on Wikipedia · Image Edmond HUET (talk), Public domain
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