CMMG ENDEAVOR — 22 ARC, 20" Barrel (Model 28B3D0CCG)
Brand: CMMG • Series: ENDEAVOR • Caliber: 22 ARC (Advanced Rifle Cartridge) • Barrel Length: 20 inches • Platform: AR-15 precision rifle • Intended Role: Varmint/predator, practical precision, long-range training • Model/SKU: 28B3D0CCG • UPC: 810148627409
Meet the next evolution of AR-15 precision. The CMMG ENDEAVOR 22 ARC with a 20" barrel is purpose-built to exploit the 22 ARC cartridge’s flat trajectory, high BC projectiles, and excellent wind performance—delivering long-range capability in a lightweight, familiar AR package. Whether you’re stacking coyotes at extended distances, ringing steel to 800+ yards (shooter and conditions dependent), or building a crossover gun for match training, ENDEAVOR gives you the stability, ergonomics, and accuracy potential the 22 ARC demands.
Why 22 ARC in the ENDEAVOR Platform?
High-BC .224 bullets, low recoil: The 22 ARC was engineered for heavy-for-caliber projectiles and long, efficient ogives. You get impressive downrange energy and less wind drift with softer recoil than larger calibers—perfect for staying on target.
AR-15 length with long-range legs: Enjoy the handling and accessories of a standard AR-15 while pushing performance more commonly associated with larger cartridges.
Feed system synergy: The 22 ARC uses a 6.5 Grendel/6mm ARC–type bolt face and runs best in Grendel-pattern magazines—a proven recipe for reliable cycling with long, sleek bullets.
20" barrel sweet spot: The extended tube maximizes velocity and consistency, offering a forgiving node window for factory loads and handloads alike.
Key Features & Specs
Caliber: 22 ARC (optimized for heavy .224" bullets and long COAL)
Barrel: 20-inch precision barrel (twist commonly optimized for 75–88+ grain bullets)
Action: AR-15 direct-impingement style operation (standard controls, simplified maintenance)
Handguard: Free-floated M-LOK® compatible rail for rigid accessory mounting without affecting barrel harmonics
Receiver Set: AR-15 pattern with precision fit (compatible with common mil-spec accessories)
Furniture/Controls: Ergonomic grip, adjustable stock, and modern ambi/expanded controls typical of the ENDEAVOR line
Muzzle: Threaded for common .22-caliber muzzle devices/suppressor mounts*
Magazine Interface: 6.5 Grendel-pattern magazines recommended for best reliability
Model/SKU: 28B3D0CCG • UPC: 810148627409
*Always verify exact thread pitch and included muzzle device in your specific package contents.
What Sets the ENDEAVOR Apart
Free-float accuracy: A rigid, free-floated handguard keeps support pressure off the barrel for more consistent POI from bags, bipods, and barricades.
Balance and control: The 20" barrel and extended sight radius stabilize your hold for prone, tripod, or positional stages.
Ready for glass & gadgets: Continuous top rail space for optics and clip-on devices; M-LOK slots for bipods, QD sling cups, and laser/illumination.
Gas-gun practicality: Faster follow-ups and less shooter fatigue than comparable bolt guns—great for high-volume varmint hunts and training days.
Ideal Use Cases
Predator & Varmint: Leverage high-BC .224 bullets to stretch coyotes and prairie dogs with laser-flat trajectories.
Gas-Gun Precision/PRC Training: Practice wind calls and positional shooting with AR ergonomics and economical recoil.
Ranch & Property Management: Lighter carry weight than big-frame ARs with the reach needed for open country.
Suppressor-Friendly Builds: The 22 ARC pairs well with modern .22-cal suppressors/mounts for recoil and blast reduction.*
*Confirm barrel thread, suppressor bore compatibility, and local laws.
Setup Tips for Best Results
Magazines: Use quality 6.5 Grendel-pattern mags for optimal 22 ARC feeding—especially with long OAL bullets.
Optics: A 2–12x, 3–15x, or 4–16x FFP scope with reliable tracking and a usable wind reticle is a perfect match.
Support Gear: Run a cant-adjustable bipod and rear bag for prone; add an ARCA plate if you shoot off tripods.
Ammo Selection: The 22 ARC shines with 75–88+ grain bullets; test a couple of factory loads to find your rifle’s sweet spot.
Gas & Buffer Tuning: If you change muzzle devices or run suppressed, consider gas adjustment and buffer tuning for optimal ejection and minimal recoil impulse.
Maintenance & Ownership
Break-in & Clean: Follow CMMG’s barrel break-in guidance; keep the free-float rail and gas system clean for consistent groups.
Torque & Threadlocker: Verify scope ring/base torque and M-LOK fasteners; apply medium threadlocker where appropriate.
Round-Count Tracking: Log round count and environmentals; 22 ARC data translates well across seasons for repeatable dope.
SEO Highlights (Copy & Paste)
CMMG ENDEAVOR 22 ARC 20" precision AR-15 rifle
Long-range .224 caliber performance with high-BC bullets and low recoil
Free-float M-LOK handguard, AR-15 ergonomics, suppressor-ready muzzle
Runs best with 6.5 Grendel-pattern magazines for reliable feeding
Model 28B3D0CCG • UPC 810148627409
Frequently Asked Questions
Q: What magazines should I use for 22 ARC?
A: 6.5 Grendel-pattern AR-15 magazines provide the most reliable feeding with the 22 ARC’s case geometry and long bullet profiles.
Q: What bullet weights work best?
A: The cartridge is optimized for 75–88+ grain .224 bullets, offering excellent downrange ballistics and wind resistance.
Q: Is the 20" barrel good for long range?
A: Yes. A 20" tube balances velocity and handling, giving the 22 ARC the speed it needs while keeping the rifle lively.
Q: Can I run a suppressor?
A: Most ENDEAVOR barrels are threaded for common .22-cal devices. Confirm thread pitch and ensure your suppressor is rated for .224 high-velocity cartridges.
Q: Is this a standard AR-15?
A: It uses AR-15 receivers and controls with a Grendel-type bolt and magazines suited to the 22 ARC case head and OAL.
Precision without the Punishment
The CMMG ENDEAVOR 22 ARC 20" (28B3D0CCG, UPC 810148627409) delivers long-range performance, soft recoil, and AR-15 familiarity in a single package—perfect for predators, prairie dogs, and practical precision practice. Mount quality glass, feed it high-BC .224 bullets, and watch your hit percentage climb.
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