CMMG 16″ 300 AAC Blackout Rifle WASP Barrel

Description

The CMMG 16″ 300 AAC Blackout Rifle is a purpose-built AR-15 platform rifle featuring a WASP-treated 4140 Chrome-Moly Vanadium steel barrel, designed for optimal performance with subsonic and supersonic 300 Blackout ammunition. It offers a versatile, hard-use foundation for home defense, hunting, or tactical training, balancing durability with the inherent advantages of the 300 BLK cartridge in a standard 16-inch configuration.

Key Features

• WASP-Treated Barrel: The 4140 Chrome-Moly Vanadium steel barrel undergoes CMMG’s proprietary WASP (Wear and Abrasion Surface Protection) treatment for enhanced corrosion resistance and extended service life.
• 300 AAC Blackout Chamber: Engineered from the ground up for the 300 BLK round, providing reliable cycling with both heavy subsonic and lighter supersonic loads without modification.
• 16-Inch Barrel Length: Maintains a handy overall length while providing full powder burn and velocity for the cartridge, making it a practical choice for a do-it-all rifle.
• Mil-Spec Compatibility: Built on a standard AR-15 pattern, allowing for easy customization with a vast aftermarket of parts and accessories. It’s mil-spec compatible, so upgrades are straightforward.
• Rigorous Testing: Each rifle is test-fired and inspected to ensure reliable function right out of the box, with no gunsmithing required for initial use.

Specifications & Details

Caliber	300 AAC Blackout
Barrel Length	16 inches
Barrel Material	4140 Chrome-Moly Vanadium Steel
Barrel Treatment	CMMG WASP (Wear and Abrasion Surface Protection)
Twist Rate	1:8 inches
Rifling	6 Groove, Right Hand Twist

The rifle’s construction centers on that 4140 CMV steel barrel—a material chosen for its toughness and fatigue resistance. The 1:8 twist rate is the sweet spot for the 300 BLK, effectively stabilizing a wide range of bullet weights from 110 grains up to 220+ grain subsonics. When it comes to home defense, that versatility means you can configure one rifle for discreet, hearing-safe indoor use with suppressors and subsonics, or load it with supersonic rounds for greater reach and terminal performance. The total package weight typically hovers around 6.5 to 7.5 pounds unloaded, depending on the final lower receiver configuration.

Who This Rifle Is For

This CMMG is for the shooter who understands the 300 Blackout’s role. It’s for the Missouri hunter pursuing deer or hog at moderate ranges with a compact, hard-hitting platform. It’s for the responsible citizen building a serious home defense system, particularly one planning to use a suppressor. It’s also for the pragmatic enthusiast who wants a durable, no-fuss rifle that serves as a reliable training tool and a capable defensive firearm. At $782.63, it represents a solid entry into the 300 BLK world without sacrificing core quality.

Pros & Cons

Pros: The WASP treatment provides a real-world durability advantage over standard phosphate finishes, especially in humid environments. The 300 BLK caliber, when paired with this 16-inch barrel, achieves its designed ballistic potential without the unnecessary length of a 5.56 rifle. Platform commonality means you can use many standard AR-15 components—think Magpul furniture, Geissele triggers, or Radian safeties—to tailor the rifle to your exact preferences. It ships to Missouri and compliant US states, ready for your FFL transfer.

Cons: Ammunition cost for 300 Blackout is significantly higher than 5.56/.223, which impacts training frequency. If you don’t plan to leverage its subsonic/suppressor capabilities, a 5.56 rifle might be more economical. The rifle is sold as an upper receiver group or complete firearm depending on source, so verify what you’re purchasing—complete firearms require an FFL transfer.

Frequently Asked Questions

Q: Will this CMMG upper work with my existing AR-15 lower receiver?

A: Yes. This 300 Blackout rifle is built to the standard AR-15/M4 pattern. It should function reliably with any mil-spec compatible lower receiver. You must use dedicated 300 Blackout magazines for optimal reliability, though some 5.56 magazines may work.

Q: What’s the real advantage of the WASP barrel treatment?

A: WASP is CMMG’s proprietary surface treatment that increases hardness and corrosion resistance beyond traditional parkerizing or nitride. Think of it as an extra layer of insurance against wear from carbon fouling, cleaning, and environmental exposure—it’s about long-term durability under hard use.

Q: Is this rifle suitable for hunting in Missouri?

A: Absolutely. The 300 AAC Blackout firing appropriate supersonic hunting ammunition (e.g., 110-125 grain expanding bullets) from a 16-inch barrel is an effective choice for whitetail deer and feral hogs within 150-200 yards, making it a very capable and maneuverable hunting tool for Missouri’s woods and brush.

Ready to build your versatile 300 Blackout platform? This CMMG rifle is available at firearms-missouri.com for Missouri residents and nationwide.