The CMMG Resolute Mk4 upper group is a complete 22 ARC AR-15 upper with a 16.1-inch barrel and a 15-inch M-Lok handguard in Armor Black. It fits a standard AR-15 lower.
- Manufacturer Part # : 28B260CAB
- Type : Complete Upper
- Caliber : 22 ARC
- Barrel Length : 16.1"
- Handguard : 15" M-Lok
- Color : Armor Black
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