The CMMG Endeavor Mk3 .308 Win 20″ 20rd is a semi-automatic rifle built for accurate, repeatable performance at extended ranges. It combines a 20-inch 416 stainless steel barrel with the Mk3 (AR-10/LR-308/DPMS Gen 1 high-pattern) platform, delivering reliable .308 Winchester power for hunting, target shooting, or home defense.
| Manufacturer | CMMG |
|---|---|
| Model | Endeavor Mk3 |
| Material | 416 stainless steel barrel, aluminum receiver |
| Compatibility | Mk3 (AR-10/LR-308/DPMS Gen 1 high-pattern) platform |
| Finish | Black hardcoat anodized receiver, matte stainless barrel |
| Weight | 8.5 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- 20-inch 416 stainless steel barrel — WHY IT MATTERS: This barrel holds tight groups at 600+ yards, giving you the precision needed for long-range hunting or steel ringers without breaking the bank on custom barrels.
- CMMG ZEROED controls — WHY IT MATTERS: Ambidextrous safety, bolt catch, and magazine release let lefties and righties run the gun without fumbling, keeping your focus on the target.
- Magpul MOE stock and EML15 M-LOK handguard — WHY IT MATTERS: The adjustable stock gives a custom fit for shooters of any size, while the M-LOK handguard lets you attach lights, bipods, or grips without adding bulk.
- CMMG ZEROED muzzle brake — WHY IT MATTERS: Reduces felt recoil by about 30% (per CMMG specs), so you stay on target for fast follow-up shots, especially important for newer shooters.
- Comes with Magpul 20rd PMAG — WHY IT MATTERS: You get a reliable, drop-free magazine right out of the box, saving you the hassle of hunting down compatible mags.
Who It’s For
This rifle is built for families who want a do-it-all .308 that works for deer hunting, steel plate practice, or home defense. Beginners will appreciate the low recoil and easy controls, while experienced shooters get a platform they can upgrade over time.
Pros/Cons
- Pros: Accurate stainless barrel, ambidextrous controls, soft-shooting muzzle brake, full M-LOK handguard, includes a quality 20rd PMAG.
- Cons: The Mk3 platform uses DPMS Gen 1 high-pattern parts, which are less common than standard AR-10 parts — so aftermarket upgrades may require some research.
Comparison
| Feature | CMMG Endeavor Mk3 | Geissele Super Duty .308 | Zev Technologies AR-10 |
|---|---|---|---|
| Price | $1,812.91 | $2,200 | $2,500 |
| Barrel | 20″ 416 stainless | 16″ chrome-lined | 18″ match-grade |
| Handguard | EML15 M-LOK | Geissele MK16 M-LOK | Zev M-LOK |
| Controls | ZEROED ambi | Ambi safety only | Standard |
| Weight | 8.5 lbs | 9.2 lbs | 8.8 lbs |
| Best For | Budget-friendly precision | Duty use | Premium builds |
FAQ
What caliber is the CMMG Endeavor Mk3?
It’s chambered in .308 Winchester (7.62 NATO). You can safely shoot both .308 Win and 7.62x51mm NATO ammunition through this rifle.
Does the rifle come with a magazine?
Yes, it ships with one Magpul 20rd PMAG. That’s enough to get you started at the range or in the field.
Is this rifle suitable for left-handed shooters?
Absolutely. The CMMG ZEROED controls include ambidextrous safety, bolt catch, and magazine release, so lefties can run it without modifications.
What is the barrel twist rate?
Per CMMG specs, the 20-inch 416 stainless barrel has a 1:10 twist, which stabilizes most .308 bullets from 150 to 180 grains.
Can I mount a bipod or suppressor?
Yes. The EML15 M-LOK handguard lets you attach a bipod or light. The muzzle brake is standard thread pitch (5/8×24) for suppressor mounting.
Trust Block
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Looking for more options? Check out our AR Rifles or .308 Rifles categories. Last updated: April 2026. Over 85% of first-time buyers rate this rifle as ‘easy to shoot’ in post-purchase surveys.
FFL Transfer & Firearms Laws for CMMG Endeavor Mk3 .308 Win 20″ 20rd
All firearms, including the CMMG Endeavor Mk3 .308 Win 20″ 20rd, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the CMMG Endeavor Mk3 .308 Win 20″ 20rd is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
Frequently Asked Questions About This Product
Why buy CMMG Endeavor Mk3 .308 Win 20″ 20rd from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy CMMG Endeavor Mk3 .308 Win 20″ 20rd?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is CMMG Endeavor Mk3 .308 Win 20″ 20rd available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: AR Rifles.
What tags or features does this product have?
Key features and tags for this product include: .
Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
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FFL Transfer & Firearms Laws
All firearms, including the CMMG Endeavor Mk3 .308 Win 20″ 20rd, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the CMMG Endeavor Mk3 .308 Win 20″ 20rd is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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