Description
You’re looking for a serious, versatile carbine that bridges the gap between a rifle’s stability and a pistol’s common, affordable ammo. You want something that feels familiar but hits harder than a 9mm, all without breaking the bank on a niche caliber. That’s the exact scenario where the CMMG Resolute 300 MKG 45 ACP 16.1″ Barrel, 6-Position Black Stock, 13rd makes its case. It’s a practical, value-focused choice for the shooter who prioritizes real-world performance over boutique appeal.
The CMMG Resolute 300 MKG 45 ACP 16.1″ Barrel, 6-Position Black Stock, 13rd is a radial-delay blowback AR-pattern carbine chambered in .45 ACP. It features a 16.1-inch barrel for legal rifle classification, a 6-position adjustable stock, and ships with a single 13-round magazine. This platform offers the handling of an AR-15 with the ballistic punch of a .45 caliber round, providing a unique home defense and range option that leverages common, lower-cost ammunition compared to rifle calibers.
So, what do you get for your money? The core value here is the CMMG proprietary radial-delay blowback operating system. This isn’t a simple direct blowback gun. That system tames the .45 ACP’s recoil impulse significantly, making it feel smoother and more manageable than you’d expect. It reduces bolt velocity and felt recoil, which translates to faster follow-up shots and less shooter fatigue. That’s a major bang-for-buck feature usually found on higher-priced competition guns, not budget-friendly plinkers.
Another key practical feature is the magazine compatibility. The Resolute 300 MKG uses readily available, affordable CMMG ARC magazines. While it ships with one 13-round mag, you can easily source additional ones without hunting for rare, proprietary parts. This keeps long-term running costs down. The 16.1-inch barrel length is a smart tradeoff. It gives you a full rifle stock for a proper cheek weld and shouldered stability, which is a huge advantage over a pistol-caliber pistol, but it keeps the overall length manageable for home use. The 6-position stock lets you tailor the length of pull for different shooters or layers of clothing. At a weight around 7.5 lbs unloaded, it’s substantial but not unwieldy.
The build is mil-spec compatible where it counts, meaning a wide array of standard AR-15 grips, triggers, and handguards can be used for customization. This is a huge plus for the budget-conscious tinkerer. Want to upgrade the trigger? A standard AR drop-in unit will work. The handguard uses a standard barrel nut interface, so swapping it for a different M-LOK or KeyMod rail is typically drop-in ready with the right tools. You’re not locked into a proprietary ecosystem.
| Specification | Detail |
|---|---|
| Caliber | .45 ACP |
| Barrel Length | 16.1 inches |
| Overall Length (Extended) | Approx. 34.5 – 37.5 inches (stock dependent) |
| Operating System | Radial-Delay Blowback |
| Stock | 6-Position Adjustable, Black |
| Magazine Capacity | 13 Rounds (included) |
| Magazine Type | CMMG ARC .45 ACP |
Pros: The radial-delay system offers superior recoil management for the caliber. It uses a common, affordable, and effective round. The AR-platform familiarity means easy customization and handling. The rifle configuration provides better stability than a pistol. Magazine and many parts are standard and accessible.
Cons: At $1910.35, it’s an investment compared to a basic AR-15. The .45 ACP is subsonic, so it’s not a long-range round. Magazine capacity is lower than many 9mm PCC options. It’s heavier than a comparable 9mm carbine.
Look, this carbine isn’t for everyone. It’s for the Missouri shooter who already appreciates the .45 ACP’s performance for defense or woods carry and wants a more stable, accurate platform to launch it from. It’s for the budget-minded enthusiast who wants a unique, high-quality range toy that won’t cost a fortune per trigger pull. It’s also a solid option for those in restricted states where .45 ACP carbines are compliant while other platforms may not be. This model is available at firearms-missouri.com for Missouri residents and nationwide, with an FFL transfer required for firearm purchases.
Frequently Asked Questions
Q: Will this work with my existing Glock .45 ACP magazines?
A: No. The CMMG Resolute 300 MKG uses proprietary CMMG ARC magazines designed for its bolt and lower receiver. It is not compatible with Glock-pattern magazines, which is a tradeoff for the more integrated, reliable feeding of the ARC system.
Q: Can I shoot .45 ACP +P ammunition through this?
A: CMMG generally states their firearms are rated for SAAMI-spec ammunition, which includes +P. However, always consult your specific owner’s manual and start with standard pressure rounds to ensure reliable function. The radial-delay system handles pressure well, but consistent use of very hot loads may increase wear.
Q: Is the upper receiver compatible with a standard AR-15 lower?
A: No, it is not. The CMMG Resolute 300 is a complete, dedicated .45 ACP firearm. The lower receiver is designed specifically for the ARC magazines and the radial-delay blowback bolt carrier group. You cannot simply swap this upper onto a standard 5.56 lower.
If a versatile, soft-shooting .45 ACP carbine that prioritizes value and practical performance fits your needs, the CMMG Resolute 300 MKG deserves a close look.
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