Introducing the Mitchell Defense DualCool ARCA15 AR-15 M-LOK Handguard. DualCool CP1 - Dual-Layer ARCA Handguard for AR-15. The DualCool CP1 ARCA Rail Edition is the only dual-layer ARCA handguard built for AR-15 platforms. Designed for precision shooters, it combines advanced thermal control with an integrated ARCA interface for unmatched stability, repeatability, and performance. The DualCool CP1 was engineered to solve the problem every shooter faces - heat. Its dual-layer construction and engineered air-gap thermal barrier keep the outer shell cooler during sustained fire while accelerating cooldown between shot strings. This makes it one of the most advanced ARCA rail handguards available. Why a dual cooling layer? Unlike traditional single-layer aluminum rails, the DualCool CP1 separates the inner and outer shells with a thermal air gap. Heat is absorbed and managed by the inner shell while the outer surface remains cooler and safer to grip. The engineered space between shells...