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PRODUCT #57B40E4

UPPER GROUP, RESOLUTE, 5.7X28MM, 16.1"

$999.95

$999.95
or 4 payments of $249.99 with
ⓘ

Expected to ship within 15-30 business days.

State/local restrictions may apply. Please review our Firearms Shipping Policy prior to ordering.

UPPER GROUP, RESOLUTE, 5.7X28MM, 16.1"

Personal defense calibers like 5.7x28mm have become a big thing in the last few years, and if you’re looking for PDW ballistics and the classic style and balance of a carbine then you’re in luck. Combine this RESOLUTE® Upper Group with either our Mk57 Lower or a standard AR15 lower group and CMMG®’s 5.7 AR Conversion Magazines and you’ll be ready to hit the range! Available in seven different Cerakote finishes, all CMMG® Upper Groups come complete with bolt carrier group and ZEROED™ accessories including:

ZEROED AR15 Polymer Dust Cover

ZEROED AR15 Ambi Charging Handle

ZEROED Muzzle Brake 5.56mm

 

Radial Delayed Blowback™ Operating System

Originally developed for the .45 ACP MkG platform, CMMG has adapted our Radial Delayed Blowback system across our pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems. Check out our CMMG Resources article & video to learn more about what sets Radial Delayed Blowback apart.

 

Lifetime Quality Guarantee

We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.

What Our Customers Are Saying
5.0 star rating

Steve L

I put it on my AR15 lower fits perfect. The color really looks good on my AR. THE WORKMANSHIP IS FANTASTIC

Forrest L.

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5.0 star rating

Excellent Fit and Finish

Top quality product from CMMG. Paired with a Bushmaster lower, fit was spot on and finish even matched, too. Very pleased as it performs flawlessly with a smooth action and magazine holds bolt open on last round. Shooting tight groups with FN 40 gr V-Max ammo. Appreciate the ambi charging handle and the light weight of the unit. 100% happy with the purchase. This will relegate the old .22 Mag to a dust collector.

Tom S.

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5.0 star rating

Great Product

Functioned perfectly. Manual of arms the same as original upper. Holds bolt open on last round, appreciated! Close bolt using the same button as original. Finish and fitment are both top notch. Recommend without reservations.

William P.

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Technical Specifications

Platform Mk4, Mk57
Caliber 5.7x28mm
Operating System Radial Delayed Blowback
Barrel Length 16.1
Barrel Twist 1:9
Barrel Contour MT
Barrel Material 4140CM, SBN
Barrel Twist 1:9
Muzzle Device CMMG ZEROED Muzzle Brake
Muzzle Thread 1/2 x 28
Gas Port Location N/A
Gas Block N/A
Upper Receiver Billet 6061 T6 Aluminum
Hand Guard CMMG EML15 M-LOK
Finish Cerakote Standard
Charging Handle CMMG ZEROED Ambi
Weight 4.0 lbs
Length 25.3"

Reviews

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