CMMG Resolute MK4 .22 ARC

The CMMG Resolute MK4 brings the 22 ARC cartridge into a compact, semi-automatic AR-15 platform that’s built for hunters who need follow-up shots, not just one clean kill. With a 16.1" barrel, M-LOK handguard, and CMMG’s optional Radial Delayed Blowback system, this rifle targets varmint and predator hunters who want AR-15 familiarity without sacrificing meaningful terminal performance. At $1,350–$1,450 street price, it sits in mid-tier AR territory – not cheap, but not boutique either.

Quick Verdict: CMMG Resolute MK4 .22 ARC

✓ Best for: Varmint and predator hunters who need semi-auto follow-up capability inside 400 yards
✓ Price: $1,350–$1,450 street
✓ Key strength: Compact 16.1" AR-15 platform chambered in 22 ARC with standard PMAG compatibility
✗ Not ideal for: Long-range precision past 500 yards or shooters who want maximum 22 ARC velocity

Real-World Performance at the Range

The CMMG Resolute MK4 22 ARC delivers honest, if not spectacular, accuracy from its 16.1" barrel. Hornady 88gr ELD-M runs approximately 2,700–2,800 fps out of this barrel – roughly 300 fps slower than a 22" bolt gun – which translates to a practical varmint ceiling around 400–500 yards rather than the 600+ yards the cartridge achieves from longer tubes. Factory trigger groups at around 6 lbs, and that pull weight is the primary accuracy limiter; expect 1.0–1.5 MOA with the stock trigger and quality ammunition. Swap in a Geissele SSA-E and that tightens to 0.6–0.9 MOA at 100 yards – a meaningful improvement that makes the platform genuinely useful for varmint work. The 62gr ELD-VT at approximately 3,000 fps is the better choice for this barrel length, trading some long-range ballistic coefficient for retained velocity where the short barrel costs you least. Semi-auto gas system variability does widen groups slightly compared to a bolt gun at equivalent distances, but for the hunting applications this rifle targets, the trade-off is acceptable.

Applications & Use Cases for the Resolute

Prairie dog and ground squirrel hunting is where the CMMG Resolute MK4 22 ARC earns its keep most convincingly. When dogs are popping up across a colony and a first shot misses or anchors one while another presents, the semi-auto action and 10-round PMAG let you follow up without cycling a bolt. Inside 400 yards with the 62gr ELD-VT, the Resolute handles this scenario well – the velocity loss from the 16.1" barrel matters less when targets are closer and speed of follow-up matters more.

Predator hunting – specifically coyotes called into a field – is another strong application. When two or three coyotes respond to a call simultaneously, a semi-auto in 22 ARC gives you a real advantage over a bolt gun. The cartridge is flat enough for 200–300 yard shots on coyotes, and the Resolute’s collapsible stock and 6.8 lb weight make it manageable from a seated or bipod position in a blind or truck window.

Truck gun and ranch pest control round out the practical use cases. The 16.1" barrel plus collapsed MFT Minimalist stock keeps overall length at 32.25" – genuinely compact for behind-the-seat storage. The 22 ARC delivers substantially more terminal performance than 22 LR or 22 WMR for ranch pest control, and the AR-15 platform means anyone familiar with the system can run it without relearning manual of arms.

Ergonomics & Handling in the Field

The CMMG Resolute MK4 22 ARC handles like a well-built mid-tier AR-15, which is exactly what it is. At 6.8 lbs unloaded, it’s not a featherweight – add a scope, bipod, and loaded magazine and you’re pushing 8.5 lbs – but it balances well with the medium-contour 16.1" barrel keeping weight forward without being muzzle-heavy. The MFT Minimalist stock adjusts across six positions and fits shooters from compact to large frames without complaint. The M-LOK handguard gives you a clean, slim grip surface with full accessory mounting flexibility. The CMMG RDB trigger at 6 lbs is the one ergonomic weak point – it’s not gritty or unpredictable, just heavier than ideal for a precision-oriented cartridge. Controls are standard AR-15 throughout, which is either a strength or a non-factor depending on your existing platform familiarity.

Aftermarket & Upgrade Path for the MK4

The CMMG Resolute MK4 22 ARC benefits from the full AR-15 aftermarket ecosystem, which is the broadest in the semi-auto rifle world. The trigger upgrade is the first and most impactful modification – a Geissele SSA-E at $240 or TriggerTech AR at $200 transforms the accuracy potential of this platform and should be considered a near-mandatory addition for anyone using it for varmint precision work. The 5/8×24 threaded muzzle accepts suppressors directly; pairing the Resolute with a SilencerCo Omega 300 creates a hearing-safe semi-auto 22 ARC setup that’s genuinely practical for predator work. The M-LOK handguard accepts Harris bipods, lights, and foregrips without adapters. Magazines are standard AR-15 PMAGs – no proprietary feeding system to work around. Optic selection is wide open via the Picatinny top rail; a Vortex Strike Eagle 1–6×24 at $280 pairs well with the compact barrel for versatile varmint use.

Pros & Cons of the CMMG Resolute MK4

Strengths:
✓ Semi-auto follow-up speed – meaningful advantage over bolt guns for prairie dog and coyote work
✓ Standard AR-15 PMAG compatibility – no proprietary magazine system
✓ 16.1" barrel keeps overall length at 32.25" collapsed – genuinely compact for vehicle carry
✓ 5/8×24 threaded barrel – suppressor-ready out of the box
✓ Radial Delayed Blowback option – CMMG’s proprietary system improves cycling reliability with intermediate calibers
✓ Multiple Cerakote finish options – more variety than most AR manufacturers offer
✓ Full AR-15 aftermarket ecosystem – triggers, stocks, handguards, optics all compatible
✓ Mid-tier build quality – milspec-plus components without boutique pricing

Limitations:
✗ 16.1" barrel loses ~300 fps vs 22" bolt guns – practical range ceiling drops to 400–500 yards
✗ Factory 6 lbs trigger – too heavy for precision 22 ARC use; budget $200–240 for immediate upgrade
✗ $1,350–$1,450 street price – $700–800 more than Bear Creek Arsenal 22 ARC AR
✗ Semi-auto gas variability widens groups vs bolt guns at equivalent distances
✗ 22 ARC ammo cost at semi-auto round counts adds up quickly
✗ Not competitive with bolt guns past 600 yards for precision varmint work

Competitors & Alternatives Worth Considering

The CMMG Endeavor MK4 22 ARC is the most direct internal comparison – same manufacturer, same mid-tier quality, but the 20" barrel recovers that 300 fps the Resolute sacrifices and pushes practical range back toward 550–600 yards. If compactness isn’t a priority, the Endeavor is the better long-range choice at similar money. The Rise Armament Watchman XR 22 ARC brings a billet receiver and the excellent RA-535 trigger from the factory, which eliminates the trigger upgrade cost – but it runs $50–150 more and lacks CMMG’s Radial Delayed Blowback option. The Bear Creek Arsenal BC-15 22 ARC undercuts the Resolute by $700–800 and is a functional budget AR, but component quality, fit, and finish are noticeably lower – the CMMG mid-tier build justifies the price gap for serious hunters.

Who Should Buy the CMMG Resolute MK4

The CMMG Resolute MK4 22 ARC is the right rifle for varmint and predator hunters who are already invested in the AR-15 platform and want 22 ARC performance with semi-auto follow-up capability in a compact package. If you’re running prairie dog towns or calling coyotes where multiple targets present quickly, the Resolute’s semi-auto speed and PMAG compatibility are genuine operational advantages over any bolt gun. Look elsewhere if you want maximum 22 ARC velocity – the CMMG Endeavor MK4 22 ARC with its 20" barrel is the better choice – or if budget is the primary driver, where the Bear Creek Arsenal BC-15 22 ARC saves you $700 at the cost of component quality.

Frequently Asked Questions

Q: What is the effective range of the CMMG Resolute MK4 in 22 ARC?
A: From the 16.1" barrel, practical varmint range is 400–500 yards with 88gr ELD-M at ~2,750 fps. Longer barrels push this to 600+ yards.

Q: Does the Resolute use standard AR-15 magazines?
A: Yes – standard AR-15 PMAGs work directly. No proprietary magazine system required.

Q: What is the barrel thread pitch on the Resolute MK4?
A: 5/8×24 – standard for suppressor mounting and most muzzle devices in this caliber range.

Q: Is the factory trigger adequate for varmint hunting?
A: At ~6 lbs, it’s functional but limiting for precision work. A Geissele SSA-E or TriggerTech AR upgrade is strongly recommended and improves accuracy to 0.6–0.9 MOA.

Q: What is CMMG’s Radial Delayed Blowback system?
A: It’s CMMG’s proprietary bolt design that slows bolt carrier velocity during extraction, improving reliability and reducing felt recoil with intermediate AR calibers like 22 ARC.

Q: How does the Resolute compare to a bolt-action 22 ARC rifle for accuracy?
A: Bolt guns are more accurate – expect 0.5 MOA or better from quality bolt actions vs 1.0–1.5 MOA from the Resolute factory. The Resolute trades precision for semi-auto speed and follow-up capability.

Final Verdict – CMMG Resolute MK4 .22 ARC

The CMMG Resolute MK4 22 ARC is a well-built, compact semi-auto AR for hunters who prioritize follow-up shot speed over maximum ballistic performance from the 22 ARC cartridge. Budget $200 for a trigger upgrade immediately – it’s not optional if you want to use this platform to its potential. If you work inside 400 yards on varmints or predators and want an AR-15 that runs 22 ARC reliably, the Resolute delivers. Long-range precision shooters should look at bolt guns or the longer-barreled Endeavor instead.

The CMMG Resolute MK4 22 ARC fills a specific niche well – semi-auto 22 ARC in a compact AR-15 form factor for hunters who need speed, not just precision. It’s not the most accurate 22 ARC platform available, and the factory trigger needs replacing before you’ll see what the cartridge can really do. But for prairie dog colonies, coyote groups, and truck gun duty inside 400 yards, it’s a practical, reliable mid-tier AR that earns its $1,400 asking price – provided you go in with realistic expectations about what a 16.1" barrel gives up.