The CMMG Resolute Mk4 upper group is chambered in 300 Blackout with a 16.1-inch barrel, an Armor Black finish and a free-float M-Lok handguard. It fits AR-15 lowers and does not include a bolt carrier group or charging handle.
- Manufacturer Part # : 30BC40AAB
- Type : Upper Receiver Group
- Caliber : 300 Blackout
- Barrel Length : 16.1"
- Finish : Armor Black
- Handguard : Free-Float M-Lok
- Platform : AR-15
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