AR Gas Systems Explained: Pistons, Ports, & DI Glory

Guide to Everything AR

Every autoloading AR-15 has an action that is gas-operated, meaning it uses exhaust gases from the spent propellant to work the bolt.

To help clarify this often murky ground we’ll cover the world of gas systems, how they work, and the realities of ports and gas system lengths.

By Michael Crites

Michael Crites is el jefe around here. He has spent more than 30 years shooting, learning about guns, and collecting firearms old and new. He holds his Oregon Concealed Handgun License, and enjoys testing products in the back 40 of his farm.

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