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Posted in these groups: 
GunsmithingTactical Firearms
Firearms and Guns
Handguns and Pistols
Rifle Shooting
GunsmithingTactical Firearms Firearms and Guns Handguns and Pistols Rifle Shooting
Posted >1 y ago
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Direct impingement is dirtier. Piston systems are cleaner but as I recall, they're usually more expensive.
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I never knew this information, thanks.
https://www.tacticalmachining.com/learn/ar-style-rifles/di-ar-15-vs-piston-ar-15.html
https://www.tacticalmachining.com/learn/ar-style-rifles/di-ar-15-vs-piston-ar-15.html
DI vs Piston | AR Style Rifles | Learn
At Tactical Machining we sell quality gun parts at affordable prices. Visit our online catalog to view the selection of 80% Receivers, 100% Receivers, AR-15 Uppers, suppressors and custom shop.
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