Description
The CMMG Resolute 100 is a semi-automatic AR-platform rifle chambered in the hard-hitting 458 SOCOM cartridge. It features a 16.1″ threaded barrel with an SV brake (threaded 5/8-32), a black anodized finish, an RML15 M-Lok handguard, an A2 grip, an M4 collapsible stock, and ships with a 10-round CMMG-modified Lancer magazine. This setup delivers massive stopping power in a familiar, reliable AR-15 format, priced at $1817.10.
Key Features
- 458 SOCOM Power: Delivers terminal ballistics superior to 5.56 NATO for hunting or defense.
- 16.1″ Threaded Barrel: Comes with a factory-installed SV muzzle brake to help manage the significant recoil.
- RML15 M-Lok Handguard: Lightweight and versatile, allowing for easy attachment of lights, grips, and other accessories.
- Modified Lancer Magazine: CMMG-specific 10-round magazine ensures reliable feeding of the large 458 SOCOM rounds.
- Familiar AR Controls: Uses standard A2 grip and M4 collapsible stock for immediate user familiarity.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | 458 SOCOM |
| Action | Semi-Automatic |
| Barrel Length | 16.1 inches |
| Thread Pattern | 5/8-32 (with SV Brake) |
| Handguard | RML15 M-Lok |
| Magazine Capacity | 10 Rounds |
| Finish | Black Anodized |
This rifle is built on CMMG’s proven AR platform, meaning many components are mil-spec compatible. The real story is the 458 SOCOM chambering—a round designed to offer .45-70 Gov’t-like performance from a standard AR-15 lower receiver. The complete package weighs in around 7.5 to 8 lbs unloaded, giving it a solid, balanced feel. It’s available at firearms-missouri.com for Missouri residents and nationwide.
Who This Rifle Is For
This is a specialized tool for a specific user. It’s ideal for hunters in Missouri and beyond pursuing medium to large game at short to medium ranges, where brush penetration and decisive energy transfer are critical. It’s also a serious option for those seeking a formidable defensive rifle for property or wilderness defense. Look, if you need more punch than a 5.56 or .300 Blackout but want to stay within the AR platform’s ergonomics and aftermarket, this is your budget-conscious entry point.
Pros & Cons: The Practical Tradeoffs
Pros: The primary advantage is immense power in a controllable, semi-auto package. The 458 SOCOM round is a proven performer on game. The rifle is drop-in ready with no gunsmithing required—just add optics and ammo. Using a standard AR lower means you can swap triggers or stocks easily. At just over $1800, it’s a more affordable way into the big-bore AR world compared to some custom builds.
Cons: Ammunition is expensive and less common than 5.56 NATO. Recoil, while mitigated by the brake, is still substantial. Magazine capacity is limited by the large cartridge size—that 10-round mag is standard. It’s a heavier rifle than a typical 5.56 AR, and the ballistic trajectory is much loopier, limiting effective range.
Frequently Asked Questions
Q: Will this upper fit on my existing AR-15 lower?
A: Yes, with a major caveat. The CMMG Resolute 100 is a complete rifle, but the 458 SOCOM upper is designed to work with standard AR-15 lower receivers. However, you must use the included CMMG-modified Lancer magazine or other dedicated 458 SOCOM magazines, as standard 5.56 mags will not function.
Q: What’s the effective range for hunting with the 458 SOCOM?
A: Practical hunting range is typically within 200 yards, with most shots taken much closer. The heavy, subsonic-capable round excels in dense brush and delivers tremendous energy on target, making it excellent for hog, deer, and bear at sensible distances. The 16.1-inch barrel provides a good balance of velocity and maneuverability.
Q: Is the muzzle brake removable?
A: Yes. The barrel is threaded 5/8-32, and the SV brake is attached to that thread. You can remove it to install a suppressor (checking caliber compatibility and thread alignment first) or a different muzzle device, provided it uses the same common thread pitch. Remember, a brake is highly recommended for managing recoil on this caliber.
For the shooter who needs authoritative power without abandoning the modularity of the AR platform, the CMMG Resolute 100 in 458 SOCOM presents a compelling, value-focused package. See full details and availability on our site.
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