The CMMG ENDEAVOR in 22 ARC with a 20" barrel (Model 28B3D0CAB, UPC 810148627393) is a purpose-built, long-range, AR-platform rifle designed for shooters who want flat trajectories, impressive downrange performance, and the precision needed to stretch shots well past traditional .223/5.56 distances. Chambered in the fast, efficient .22 ARC (Advanced Rifle Cartridge), this ENDEAVOR configuration is tailored for precision target shooting, varmint control, and modern long-range applications where ballistic performance truly matters.
Whether you’re setting up for steel at distance, dialing in for predator hunting, or looking for a high-performance AR that takes advantage of cutting-edge cartridge design, the CMMG ENDEAVOR 22 ARC 20" stands out as a refined, accurate, and highly capable platform.
Optimized for the 22 ARC – Modern Long-Range .22-Caliber Performance
The star of this rifle is its chambering: 22 ARC. Designed to push small-caliber performance to impressive distances, 22 ARC is engineered for:
High ballistic efficiency – Excellent BC bullets for flatter trajectories and less wind drift.
Extended effective range – Excellent for pushing well beyond typical .223/5.56 distances.
Modern AR-platform compatibility – Built to work in an AR-style setup while offering ballistic advantages for precision applications.
For shooters looking for a cartridge that bridges the gap between traditional .223 Rem/5.56 NATO and larger precision rounds, 22 ARC offers a compelling blend of speed, energy, and accuracy potential.
20" Barrel – Balance of Velocity and Handling
This CMMG ENDEAVOR 22 ARC comes equipped with a 20" barrel, a sweet-spot length for long-range ARs:
Enhanced velocity – The 20" tube gives 22 ARC the room it needs to achieve strong muzzle velocities, which translates into flatter trajectories downrange.
Improved consistency – A longer barrel helps with consistent burn and harmonics, supporting tighter groups when paired with quality ammunition.
Manageable size – While optimized for precision, the 20" barrel is still practical for field carry and positional shooting.
The result is a rifle that’s very at home on the long-range line yet remains manageable enough for real-world, practical shooting scenarios.
ENDEAVOR Series – Built for Precision
CMMG’s ENDEAVOR series rifles are specifically designed with precision in mind. Typical ENDEAVOR features (varying slightly by configuration) focus on:
Free-floated barrel systems – To keep external pressures off the barrel and maintain accuracy.
Enhanced handguards – Ideal for attaching bipods, bags, and other precision aids.
Refined triggers and controls – Supporting better shot execution and consistent follow-through.
If your goal is consistent hits at distance, the ENDEAVOR platform gives you a precision-focused foundation rather than a general-purpose carbine.
AR-Platform Versatility with Long-Range Intent
The CMMG ENDEAVOR 22 ARC 20" combines the familiarity and modularity of the AR pattern with long-range optimization:
AR-style controls – Easy to run for anyone already comfortable with the AR platform.
Modular customization – Add your preferred optic, bipod, muzzle device, and accessories to create a personalized long-range setup.
Magazine-fed design – Fast, repeatable follow-up shots and quick reloads compared to traditional bolt-action platforms.
This makes the ENDEAVOR ideal for shooters who want to take their AR experience beyond typical carbine distances and into the realm of precision and extended-range shooting.
Ideal Uses: Long-Range Targets, Varmints, and Predators
The CMMG ENDEAVOR 22 ARC 20" (28B3D0CAB) shines in several roles:
Long-range steel & paper – Pair with quality match-grade 22 ARC ammo and a good optic to ring steel at serious distances.
Varmint and predator control – The flat-shooting nature of 22 ARC makes it excellent for coyotes, prairie dogs, and similar targets (where legal, with appropriate bullet selection).
Precision training – Learn wind calls, elevation holds, and other advanced shooting skills with a modern cartridge that responds well to careful marksmanship.
If you’re looking to deepen your long-range skill set without moving to a heavy magnum platform, a 22 ARC ENDEAVOR is an outstanding option.
Key Details – CMMG ENDEAVOR 22 ARC 20" 28B3D0CAB
While exact furniture and small features can vary by specific production run and dealer description, the core identifiers for this model are:
Manufacturer: CMMG
Series: ENDEAVOR
Caliber: 22 ARC
Barrel Length: 20"
Platform: AR-style semi-automatic rifle
Intended Use: Long-range shooting, precision target work, varmint/predator applications
Model Number / SKU: 28B3D0CAB
UPC: 810148627393
These identifiers are what you’ll want to verify when shopping or cross-checking with a dealer to ensure you’re getting the exact CMMG ENDEAVOR 22 ARC 20" rifle you’re searching for.
Ready for Optics and Accessories
Like other precision-focused AR platforms, the CMMG ENDEAVOR 22 ARC is built to be used with optics:
Add a high-quality scope suitable for the distances you intend to shoot.
Pair with a bipod for prone or bench shooting stability.
Use M-LOK or similar attachment points (depending on exact handguard configuration) for sling mounts, barricade stops, or additional accessories.
This rifle is essentially a premium chassis for your long-range build—ready for you to top off and tune to your preferences.
Why Choose the CMMG ENDEAVOR 22 ARC 20"?
If you’re considering this rifle, you’re likely looking for:
A modern cartridge offering excellent ballistics in an AR platform.
A 20" precision-focused upper suitable for stretching shots to distance.
A rifle that’s purpose-built for accuracy, not just general plinking.
The CMMG ENDEAVOR 22 ARC 20" (28B3D0CAB / 810148627393) checks all of those boxes, making it a strong contender for anyone building a long-range semi-auto setup.
Responsible Use and Safe Handling
As with all firearms, the CMMG ENDEAVOR 22 ARC must be used safely and responsibly:
Always follow all local, state, and federal laws regarding purchase, possession, and use.
Treat every firearm as if it is loaded.
Keep the muzzle pointed in a safe direction at all times.
Keep your finger off the trigger until your sights are on target and you are ready to fire.
Use only quality, appropriate 22 ARC ammunition as recommended by the manufacturer.
Store the rifle securely to prevent unauthorized access.
Combined with solid safety practices and sound marksmanship, this rifle can provide years of rewarding long-range shooting.
If you’re searching for a long-range AR-platform rifle that takes advantage of the advanced ballistics of 22 ARC, the CMMG ENDEAVOR 22 ARC with 20" barrel, Model 28B3D0CAB (UPC 810148627393) is a standout choice—purpose-built for accuracy, distance, and modern performance on steel, paper, or varmints.
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