This video compares piston-operated AR-15s against traditional direct impingement (DI) systems. Piston systems, like the HK416 or BRN-4, run cleaner and cooler but are heavier and more expensive. DI systems are lighter, more cost-effective, and highly reliable due to decades of refinement. While piston systems offer benefits for high-volume full-auto fire, DI is generally the superior choice for most shooters due to its balance of reliability, weight, and cost.
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