# CMMG Endeavor 300 MK4 6mm ARC Precision Sport Rifle, 20" Barrel

**Brand:** CMMG
**Category:** Semi-Automatic Rifles
**Caliber:** 6mm ARC

## Specifications

- **Caliber:** 6mm ARC
- **Barrel Length:** 20"
- **Capacity:** 10 rounds
- **Finish:** Black Nitride
- **Weight:** 147.2 oz
- **UPC:** 810046230947
- **SKU:** UCEGCVQrT

## Description

The CMMG Endeavor 300 MK4 is a semi-automatic rifle chambered in 6mm ARC with a 20-inch barrel and 10+1 capacity. It weighs 9.20 lbs and ships new in box in black.

### Key Specifications
- **Caliber:** 6mm ARC
- **Barrel Length:** 20 inches
- **Capacity:** 10+1 rounds
- **Weight:** 9.20 lbs
- **Condition:** New in Box
- **Finish Color:** Black
- **Manufacturer:** CMMG
- **Model Number:** Endeavor 300 MK4

### Features

The barrel is 416 stainless steel with a black nitride finish and a 1:7.50" twist rate, giving it good stability across a range of bullet weights. The Magpul PRS adjustable stock lets you dial in length of pull for your build and shooting position. Magpul MOE grips and an M-LOK free float handguard round out the furniture. The handguard leaves plenty of real estate for accessories without interfering with the barrel.

The 6mm ARC caliber delivers solid terminal ballistics and manageable recoil for a 20-inch precision build.

## What Reviewers Say

*Quoted verbatim from YouTube reviews. Each link opens the video at the moment quoted.*

> I know that trigger through the ar-10 endeavor the 6'5 like I mentioned and it's a great trigger.
>
> — [Texas Plinking](https://www.youtube.com/watch?v=OvaZtCUdbSY&t=217s)

> It kind of keeps the whole platform nice and level so the recoil impulse is super light.
>
> — [Texas Plinking](https://www.youtube.com/watch?v=OvaZtCUdbSY&t=513s)

> This thing kicks less than a 65 more than 2 to 3 just what I would imagine it's a nice steady recoil impulse I have to say.
>
> — [Texas Plinking](https://www.youtube.com/watch?v=OvaZtCUdbSY&t=523s)

## What Customers Say

*AI-generated insights from customer reviews*

Owners of the CMMG Endeavor 300 MK4 in 6mm ARC generally land on the positive side, with a few practical trade-offs worth knowing.

The 20-inch barrel is consistently credited for the rifle's accuracy at longer ranges, and most users find the 6mm ARC cartridge hits the right balance between terminal performance and manageable recoil. Build quality gets good marks across the board. Materials feel solid and the fit and finish hold up. The M-LOK handguard and adjustable PRS stock make customization straightforward.

The price is the most common sticking point. Most serious shooters consider it justified, but it draws comparisons to other rifles in the same tier. Ammunition availability for 6mm ARC also comes up regularly. It's not as easy to find as .308 or 5.56, which factors into the cost of ownership.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Grabagun Com | $1775.99 |

## Similar Products

- [CMMG Endeavor 100 MK4 6mm ARC Tactical Rifle - Precision Black](https://gunsnation.com/p/cmmg-endeavor-100-mk4-6mm-arc-tactical-rifle-precision-black/UCEGCVQic)
- [CMMG Resolute MK4 6mm ARC Rifle - Precision Sport Shooter's Choice](https://gunsnation.com/p/cmmg-resolute-mk4-6mm-arc-rifle-precision-sport-shooter-s-choice/UCEGJAhlW)
- [CMMG Endeavor MK4 .22 ARC 20" Sport Rifle - Coyote Tan, 30-Rd](https://gunsnation.com/p/cmmg-endeavor-mk4-22-arc-20-sport-rifle-coyote-tan-30-rd/UCEGJR4mr)
- [CMMG Endeavor Mk4 .22 ARC 20" Midnight Bronze Precision Rifle](https://gunsnation.com/p/cmmg-endeavor-mk4-22-arc-20-midnight-bronze-precision-rifle/UCEGJR4my)
- [CMMG Dissent Mk4 6mm ARC Sport Rifle - 16.1" Precision Black 10-Rd](https://gunsnation.com/p/cmmg-dissent-mk4-6mm-arc-sport-rifle-16-1-precision-black-10-rd/UCEGJR3Un)
- [CMMG Endeavor MK4 .22 ARC 20" Semi-Auto Rifle - Black Cerakote Finish](https://gunsnation.com/p/cmmg-endeavor-mk4-22-arc-20-semi-auto-rifle-black-cerakote-finish/UCEGJR4md)

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