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For years, getting real long-range .22 caliber performance meant stepping up to a bolt gun in 22-250. The 22 ARC cartridge changed that math, and the CMMG Resolute MK4 is one of the cleanest factory platforms built around it. You get a semi-auto AR carbine that stabilizes heavy, high-BC bullets and stays supersonic way past where 5.56 runs out of steam, all in a package that weighs about 6.4 pounds and measures 32.5 inches. Prairie dogs, coyotes, and steel at distance are exactly what this rifle was made for.
The 16.1 inch barrel is 4140 chrome moly with a salt bath nitride finish, cut with a 1:7 twist to handle the long, sleek match bullets that make 22 ARC shine. It wears a rifle-length gas system paired with an adjustable gas block, which smooths out the recoil impulse and gives you room to fine tune if you run a suppressor on the 1/2×28 threaded muzzle. CMMG tops it with their ZEROED muzzle brake from the factory. The billet 6061 upper and forged 7075 lower are finished in Cerakote Armor Black, so the whole rifle shrugs off weather better than plain anodizing.
This is not a stripped-down base model. CMMG includes their ZEROED single stage drop-in trigger, ambidextrous charging handle, ambi 60/90 degree safety selector, and ambi mag catch as standard equipment. The RipStock snaps to your preset length of pull the moment you shoulder it, and the six-position Fastback receiver extension includes an ambi sling plate. Up front, the EML15 handguard runs M-LOK slots at 3, 6, 9, and 12 o'clock instead of a full-length top rail, which trims weight while leaving plenty of real estate for bipods, lights, and rail sections. Add the optic of your choice, grab some 22 ARC ammo, and you have a legitimate 600-plus yard varmint rifle backed by CMMG's lifetime guarantee.
22 ARC is built to push heavy, high-BC .22 caliber bullets at speeds that rival the 22-250, but from a standard AR-15 platform. That means flatter trajectories, less wind drift, and better retained energy at distance than 5.56 can manage. For varmint hunting and long-range steel, it is a meaningful step up while keeping semi-auto follow-up shots.
No, this rifle ships without sights, which is typical for a precision-oriented carbine like this. The upper has rail space for mounting the optic of your choice, and the EML15 handguard adds a 12 o'clock M-LOK section up front if you want to add a rail segment or accessories. A variable power scope is the natural pairing given what this cartridge can do at distance.
No, 22 ARC uses a larger case head than 5.56, so it feeds from 6.5 Grendel pattern magazines rather than standard AR-15 mags. CMMG includes a 10-round magazine with the rifle, and additional Grendel-compatible mags are widely available. Just make sure any spares you pick up are rated for the Grendel case family.
It is well set up for one. The 16.1 inch barrel has standard 1/2×28 muzzle threads, and the factory ZEROED brake removes so you can mount a suppressor or your preferred muzzle device. The adjustable gas block is the real bonus here, letting you dial the gas down for smoother, cleaner cycling when running suppressed.
| UPC | 810148627041 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 28A670CAB |
| Action | |
| ATF Type | MODERN SPORTING RIFLE |
| Barrel Length | 16.1" |
| Caliber/Gauge | .22 ARC |
| Capacity | 10 + 1 |
| Color | Black |
| Length | 39.6500 |
| Model | |
| Safety | Ambidextrous Safety Lever |
| Shipping Weight | 10.6 |
| Sights | No |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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