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2026-05-21 06:34:25 -

The Differences Between Direct Gas Impingement and Zenith Firearms’ MRDS Platform’s Roller-Delayed Blowback

The vast majority of AR style rifles, including AR pistols, or ARPs, are actuated by an operation known as direct gas impingement. Some, such as the MRDS platform used by Zenith Firearms in models like the ZF-56 and ZF-300, utilize a modern roller-delayed system, which gives the MRDS its name. But how do these differ, and what is the material impact? It’s bigger than you think....

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