The CMMG 28A7F0CAB Endeavor Mk4 in 22 ARC is a purpose-built AR-15 platform rifle that bridges the gap between varmint hunting accuracy and mid-range target shooting. Chambered in the efficient 22 ARC cartridge, this 20-inch model delivers flat trajectories and reduced recoil, making it a solid choice for shooters new to precision ARs. Built on CMMG’s Mk4 platform, it accepts standard AR-15 components for easy upgrades and maintenance.
Specifications
| Manufacturer | CMMG |
|---|---|
| Model | Endeavor Mk4 22 ARC |
| Material | 416 stainless steel barrel, 7075-T6 aluminum upper/lower receiver |
| Compatibility | Standard AR-15 components (triggers, stocks, grips, handguards) |
| Finish | Nitride-finished barrel, hardcoat anodized receiver |
| Weight | Approx. 7.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Nitride-finished 416 stainless steel barrel — WHY IT MATTERS: This treatment increases barrel life and corrosion resistance while maintaining sub-MOA accuracy potential for consistent hits at 400 yards.
- ZEROED Muzzle Brake — WHY IT MATTERS: Reduces felt recoil and muzzle rise by up to 40%, helping newer shooters stay on target for faster follow-up shots.
- EML 15-inch M-LOK Handguard — WHY IT MATTERS: The free-float design protects barrel harmonics for better accuracy, and the M-LOK slots at 12, 3, 6, and 9 o’clock give you plenty of mounting options for bipods, lights, or lasers.
- Magpul MOE Rifle Stock — WHY IT MATTERS: Adjustable length of pull lets you fit the rifle to smaller or larger shooters in the family, and the rubber buttpad absorbs shock for comfortable range sessions.
- Picatinny Top Rail — WHY IT MATTERS: Full-length rail allows direct mounting of optics without adapters, keeping your setup simple and secure.
Who It’s For
This rifle is built for families who want one gun that can do double duty: teaching new shooters the fundamentals of marksmanship at 100 yards and heading into the field for coyote or prairie dog hunting. The 22 ARC cartridge produces less recoil than a .223 Remington, so younger shooters won’t develop flinch habits. It’s also a strong choice for anyone upgrading from a basic entry-level AR to something with better accuracy and longer reach.
Pros & Cons
- Pro: Nitride barrel finish extends service life beyond standard chrome-moly barrels — expect 10,000+ rounds of accurate fire.
- Pro: 22 ARC cartridge offers flatter trajectory than .223 Remington, with 30% less wind drift at 400 yards.
- Con: Ammunition availability for 22 ARC is still growing; you may need to order online or reload to keep it fed consistently.
Comparison vs. Similar Rifles
| Feature | CMMG Endeavor Mk4 22 ARC | Geissele Super Duty 16″ | Zev Technologies OZ-9 Rifle |
|---|---|---|---|
| Caliber | 22 ARC | 5.56 NATO | 5.56 NATO |
| Barrel Length | 20 inches | 16 inches | 16 inches |
| Barrel Material | 416 Stainless Steel, Nitride | Chrome-moly, Chrome-lined | 416 Stainless Steel, Nitride |
| Handguard | EML 15″ M-LOK | Geissele MK16 13.5″ M-LOK | Zev M-LOK 15″ |
| Stock | Magpul MOE Rifle | Geissele Super 42 Buffer System | Zev Carbine Stock |
| Weight | 7.8 lbs | 6.9 lbs | 6.5 lbs |
| Price | $1,399.28 | $1,799.00 | $1,999.00 |
FAQ
What is the effective range of the CMMG Endeavor Mk4 in 22 ARC?
With the 20-inch barrel and 22 ARC cartridge, you can reliably engage targets out to 500 yards on steel or varmint-sized game. The flat trajectory keeps bullet drop manageable for newer shooters at 300–400 yards.
Can I use standard AR-15 magazines with this rifle?
Yes, the 22 ARC uses standard AR-15 pattern magazines. CMMG recommends using their dedicated 22 ARC magazines for best reliability, but standard 5.56 magazines will work in a pinch.
Is this rifle suitable for youth shooters?
Yes, the reduced recoil of the 22 ARC combined with the adjustable Magpul stock makes it a great option for teaching younger family members. The muzzle brake further tames recoil, and the 20-inch barrel provides a balanced feel.
Does the rifle come with a warranty?
CMMG backs the Endeavor Mk4 with a lifetime warranty against manufacturing defects. Per CMMG, they cover the original owner for the life of the product.
Why Buy From Us
- ✅ Nationwide delivery (all 50 states)
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Looking to compare more options? Check out our AR Rifles collection or browse AR Parts for upgrades. If you’re new to the 22 ARC, our Ammunition section has factory loads to get you started.
Last updated: April 2026
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This CMMG 28A7F0CAB ENDEAVOR MK4 22ARC 20 ARBLK is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
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