# CMMG Resolute MK4 5.56 Tactical Rifle - Precision Black Finish

**Brand:** CMMG
**Category:** Semi-Automatic Rifles
**Caliber:** 5.56 NATO

## Specifications

- **Caliber:** 5.56 NATO
- **Barrel Length:** 16.1"
- **UPC:** 810103473461
- **SKU:** UCEGGNcFp

## Description

The CMMG Resolute MK4 is an AR-style upper chambered in 5.56 NATO with a 16.1-inch barrel and black finish.

### Key specifications:
- **Barrel Length:** 16.1 inches
- **Caliber:** 5.56 NATO
- **Condition:** New in Box
- **Finish:** Black
- **Manufacturer:** CMMG
- **Model:** Resolute MK4
- **Type:** Uppers
- **Manufacturer Part Number:** 55BB40BAB
- **UPC:** 810103473461

### Detailed features:

The 16.1-inch barrel is just above the 16-inch minimum for a rifle-length barrel, keeping the build in rifle configuration without NFA paperwork. 5.56 NATO is a standard AR caliber with broad ammunition availability and manageable recoil.

The black finish provides corrosion resistance. The MK4 designation refers to CMMG's standard AR-15 platform, using standard AR-15 compatible components and lower receivers.

### Usage notes:

The Resolute MK4 is a conventional 5.56 AR upper suitable for range use, competition, or defensive configurations. It fits any standard AR-15 lower. Accessories and aftermarket parts are widely available given the standard platform.

## Frequently Asked Questions

**Q: What caliber is the CMMG Resolute MK4?**

A: The Resolute MK4 is chambered in 5.56 NATO.

**Q: Who makes the Resolute MK4?**

A: It is made by CMMG.

**Q: What is the barrel length of the CMMG Resolute MK4?**

A: The barrel is 16.1 inches long.

**Q: What type of firearm is the CMMG Resolute MK4?**

A: It is an AR-style upper receiver on the MK4 platform. It fits standard AR-15 lower receivers.

**Q: Does the CMMG Resolute MK4 include a bolt carrier group and charging handle?**

A: No. The Resolute MK4 upper does not include a bolt carrier group or charging handle.

**Q: Where can I buy the CMMG Resolute MK4?**

A: Compare current vendor offers on this page.

## What Customers Say

*AI-generated insights from customer reviews*

Owners are generally positive about the Resolute MK4. Build quality is the most consistent praise. The finish holds up and the rifle functions reliably. Accuracy gets good marks, and the adjustable stock options allow for a reasonable fit across different shooter sizes.

The main criticism is price. It sits in a range where buyers compare it against both budget builds and more premium options, and some feel it needs to justify the cost more clearly against either end. Availability of model-specific accessories has also come up occasionally, though standard AR-15 parts fit without issue.

Overall feedback leans positive. It's a well-made AR upper on a standard platform, which means parts and accessories aren't hard to find, and the construction quality is above budget-tier.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Grabagun Com | $459.99 |

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*Data from [GunsNation](https://gunsnation.com)*