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While the roller-delayed blowback mechanism has proven reliable in platforms like the Heckler & Koch G3, Zenith Firearms has taken this innovative operating system and paired it with a modern, AR-style feature set in its MRDS.
Since 2019, Springfield Armory has offered its Saint Victor line of AR-15s with enhanced features, and for 2025, the company has updated those features to keep pace with consumer demands.