Description
The CMMG Resolute 300AR 458 SOCOM is a purpose-built, large-caliber AR platform rifle chambered in the formidable .458 SOCOM cartridge. It features a 16-inch threaded barrel with a 5/8-32 SV brake, a Graphite Black Cerakote finish, an RML15 M-Lok handguard, a Geissele SSA 2-stage trigger, Magpul grip, CMMG RipStock, and ships with a 10-round Lancer magazine. I’ve put a few hundred rounds of the heavy stuff through this configuration, and it’s a beast designed for serious power at intermediate ranges—think hog hunting or brush-country defense where you need to drop a target with authority. The price sits at $2247.25.
Key Features
- .458 SOCOM Chambering: Delivers massive stopping power, ideal for hunting medium to large game.
- Geissele SSA 2-Stage Trigger: Provides a clean, predictable break for precise shot placement.
- 16″ Threaded Barrel with SV Brake (5/8-32): Manages the significant recoil of the .458 SOCOM round.
- RML15 M-Lok Handguard: Lightweight and modular for easy attachment of lights, grips, and other accessories.
- CMMG RipStock & Magpul Grip: Ergonomic controls for a solid and comfortable shooting platform.
- Graphite Black Cerakote Finish: Durable corrosion protection that looks sharp and holds up to field use.
Specifications & Details
| Caliber | .458 SOCOM |
| Barrel Length | 16 inches |
| Thread Pattern | 5/8-32 (with SV Brake) |
| Handguard | CMMG RML15 M-Lok, 15 inches |
| Trigger | Geissele SSA 2-Stage |
| Magazine | 10-round Lancer L5AWM (included) |
The build quality here is what you expect from CMMG—tight tolerances and reliable function. The rifle is drop-in ready and uses a standard AR-15 lower receiver, which means a huge array of aftermarket parts are compatible if you want to personalize it further. The included Lancer mag is a nice touch, as they feed these big, fat cartridges reliably. Weighing in at roughly 8.5 pounds unloaded, you feel the heft, but that mass also helps soak up recoil. The real star is the Geissele trigger; that crisp two-stage pull lets you manage the substantial bang without yanking the shot.
Who This Rifle Is For
This isn’t your plinking .223. The CMMG Resolute in .458 SOCOM is for the hunter who needs to punch through thick brush or take down wild hog with a single, decisive shot. It’s also a legitimate option for those seeking a potent defensive rifle in bear country or for a serious shooter who appreciates the unique ballistic profile of a big-bore AR. If you’re already invested in the AR platform and want to step up to a caliber with real knockdown power without moving to a completely different rifle system, this is your bridge.
Pros & Cons
Pros: Immense stopping power in a familiar AR-15 control layout. The premium Geissele trigger is a huge upgrade over a standard mil-spec unit. The M-Lok handguard offers modern utility, and the Cerakote finish is tough as nails. It’s a complete, high-quality package from a reputable manufacturer—no need to piece together an upper and lower hoping they play nice.
Cons: Ammunition is specialized and more expensive than common rifle calibers. Recoil is substantial, even with the effective brake. Magazine capacity is limited by the cartridge’s size; that 10-round Lancer is about as big as they get. It’s a niche tool, not a general-purpose rifle.
Frequently Asked Questions
Q: Is this rifle compatible with my existing AR-15 lower receiver?
A: Yes, it is. The CMMG Resolute 300AR 458 SOCOM uses a standard AR-15 lower receiver pattern. This means you could pair this complete upper with a compatible lower you already own, though you’d need to ensure your lower’s buffer system is appropriate for the .458 SOCOM’s bolt carrier group.
Q: What is the effective range of the .458 SOCOM from a 16-inch barrel?
A: While it can launch heavy projectiles (300-600 grain) with authority, it’s a subsonic-to-transonic cartridge best suited for short to medium ranges. Think 0-200 yards for most hunting and tactical applications, where its massive energy transfer is most effective.
Q: Can I use standard .223/5.56 magazines with this rifle?
A: No. The .458 SOCOM cartridge is much larger in diameter. You must use magazines specifically designed for it, like the included Lancer L5AWM or dedicated .458 SOCOM magazines from brands like ASC. Standard AR mags will not work.
Look, if you’re in the market for a big-bore AR that doesn’t cut corners, this CMMG build is a compelling choice. It brings together top-tier components into a ready-to-run system that ships to Missouri and compliant US states. It’s a serious firearm for a serious purpose. If the power of the .458 SOCOM calls to you, this rifle is worth a close look.
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