Delta's DI vs Piston AR15 (SFOD-D) [Range Talk]
This video compares the evolution of Delta Force's AR-15 platforms, contrasting the traditional Direct Impingement (DI) system with the modern Heckler & Koch HK416 piston-driven system. It delves into the technical reasons for the shift, focusing on improved reliability with short barrels and suppressors, reduced gas blowback, and consistent performance across environmental extremes. The discussion highlights how modern DI systems are finely tuned, while piston systems offer a broader operational window.






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