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9 things about gas piston AR-15s that POF-USA says solve problems direct impingement rifles still have

The AR-15 world has long debated gas piston versus direct impingement, and POF-USA has been one of the loudest voices arguing that the old system still leaves key issues unresolved. From heat and ...
Military.com

Piston-Driven AR-15 vs. Direct Impingement

If the crap hits the fan, do you bet your life on a piston-driven AR-15, or the original direct impingement? David Fortier and J. Guthrie argue their points. Stay connected to your community and take ...