CMMG Resolute MK4 AR-15 Complete Upper Receiver - 16.1" - 6mm ARC - Armor Black Cerakote
or 4 interest-free payments of $237.49 with 
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Backed by the CMMG Warranty! what it covers
Product description
Long-Range 6mm ARC Performance in a Standard AR-15 Footprint
Features
- Complete 6mm ARC upper receiver group for compatible AR-15 lower receivers
- 16.1″ barrel with fast 1:7.5 twist rate
- Rifle-length direct-impingement gas system with .750″ non-adjustable gas block
- CMMG EML15 free-float M-LOK handguard provides ample accessory mounting space
- ZEROED ambidextrous charging handle provides access from either side
- ZEROED 6.5mm muzzle brake installed on 5/8×24 muzzle threads
- Armor Black Cerakote finish
The CMMG Resolute Mk4 complete upper brings 6mm ARC capability to the AR-15 platform without moving to a larger-frame rifle. Its 16.1″ barrel, rifle-length gas system, free-float EML15 handguard, and included caliber-specific bolt carrier group provide the major upper components needed to convert a compatible AR-15 lower to 6mm ARC.
Note: 6mm ARC requires a compatible 6mm ARC or 6.5 Grendel-pattern magazine; standard 5.56 AR-15 magazines are not suitable. The caliber-specific bolt carrier group is included with this complete upper.
Specifications
- Brand: CMMG
- Model: Resolute Mk4
- MPN: 60B1091-AB
- Caliber: 6mm ARC
- Barrel Length: 16.1″
- Barrel Profile: Medium Taper
- Twist Rate: 1:7.5
- Gas System Length: Rifle
- Gas Block Diameter: .750″
- Gas Block: Non-Adjustable
- Muzzle Thread: 5/8×24
- Muzzle Device: CMMG ZEROED 6.5mm Muzzle Brake
- Handguard: CMMG EML15 M-LOK
- Charging Handle: CMMG ZEROED Ambidextrous
- Upper Receiver: Billet 6061-T6 Aluminum
- Finish: Armor Black Cerakote
- Fit: Mk4 / Compatible AR-15 Lower Receivers
What’s Included
- 1x CMMG Resolute Mk4 16.1″ 6mm ARC Complete Upper Receiver Assembly
- 1x 6mm ARC Bolt Carrier Group
- 1x CMMG ZEROED Ambidextrous Charging Handle
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Warranty & returns
Backed by the CMMG Warranty!
CMMG Warranty
Seller warrants to Buyer that for a period of 6 months from the Delivery Date, all Goods will be:
- Free from any defects in workmanship, material, and design
- Conform to applicable specifications[, drawings, designs, samples and other requirements specified by Buyer]
- Fit for their intended purpose and operate as intended
- Merchantable
- Free and clear of all liens, security interests or other encumbrances
- Not infringe or misappropriate any third party’s patent or other intellectual property rights.
Inspection and Rejection of Nonconforming Goods
The Buyer has the right to inspect the Goods for a period of thirty (30) days after the Delivery Date. Buyer, at its sole option, may inspect all or a sample of the Goods and may reject all or any portion of the Goods if it determines the Goods are non-conforming or defective.
If Buyer rejects any portion of the Goods, Buyer has the right, effective upon written notice to Seller, to:
- Rescind the Order in its entirety
- Accept the Goods at a reasonably reduced price
- Reject the Goods and require replacement of the rejected Goods.
NOTES:
If Buyer requires replacement of the Goods, Seller shall, at its expense, promptly/within 30 days replace the nonconforming Goods and pay for all related expenses, including, but not limited to, transportation charges for the return of the defective goods and the delivery of replacement Goods.
If Seller fails to timely deliver replacement Goods, Buyer may replace them with goods from a third party and charge Seller the cost thereof and terminate this Order for cause pursuant to Section 20.
Any inspection or other action by Buyer under this Section shall not reduce or otherwise affect Seller’s obligations under the Order, and Buyer shall have the right to conduct further inspections after Seller has carried out its remedial actions.
Disclaimer: Manufacturer’s warranty is subject to change without prior notice.
90-day no-hassle returns
The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.
If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.