This review delves into the evolution of piston-driven AR-15 platforms, tracing lineage from the HK 416 to the Sig Sauer 516 and Caracal 816. It highlights design differences, mechanical similarities, and legal issues, while also debating the piston vs. direct impingement (DI) system. The review concludes that while piston ARs offer benefits like easier gas adjustment, modern DI systems have largely closed the performance gap, making them less of a necessity for suppressor use.
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