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Upper receiver assembly for AR-15 chambered in .22 LR. CMMG Resolute MK4 22 LR upper with a 16.1 inch nitride finished barrel and 25-round magazine compatibility. Built on the Mk4 AR-15 platform with ZEROED parts and RIPSTOCK features. Features the EML 15 handguard with M-LOK attachment slots. Designed to pair with a separate Mk4 lower receiver to form a complete AR-15. Includes upper receiver, barrel, handguard, bolt carrier group, and charging handle.
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