CM15 300 Blackout 16″ AR15 Rifle – Cobalt Kinetics Green

300 Blackout Hog Hunting Rifle with Semi-Automatic Capability

The CM15 300 Blackout Hog Hunting Rifle is a complete Chattahoochee Munitions firearm manufactured for hunters who want semi-automatic operation, a conventional 16-inch rifle configuration and a tunable operating system. The Cobalt Kinetics Green and Coyote finish gives this model a distinctive field-ready appearance without being used to manufacture artificial search intent.

This CM15 combines billet receivers, a 16-inch 1:7 twist CrMV barrel, pistol-length gas, a Superlative Arms adjustable gas block and an ODIN Works adjustable buffer. Every CM semi-automatic firearm is test-fired and verified for proper operation before shipment.

The 16-inch barrel serves customers who prefer a conventional rifle without a pistol configuration, pinned-and-welded muzzle device or registered short-barreled rifle. Chattahoochee Munitions does not present the additional barrel length as providing a meaningful velocity advantage beyond CM’s preferred 10–10.5-inch 300 BLK range.

Explore the complete Sector 300 ecosystem for related CM15 firearms, CM7S bolt actions, upper receivers, magazines and technical resources.

Why Choose a 300 Blackout Hog Hunting Rifle?

A 300 Blackout Hog Hunting Rifle should provide dependable feeding, controllable semi-automatic operation and the ability to place follow-up shots when field conditions require them. Those requirements make the CM15 a more natural owner of hog-hunting intent than the manually operated CM7S.

The 16-inch CM15 also provides a conventional rifle configuration for hunters who do not want to manage pistol-brace considerations or the transfer requirements associated with an SBR. Its adjustable B5 Systems SOPMOD stock provides a useful length-of-pull range for different shooters, field positions and seasonal clothing.

Ammunition selection remains critical. Hunters should choose a projectile engineered to perform at the anticipated impact velocity, confirm accuracy and point of impact through the individual firearm, and follow all state and local hunting regulations. Bullet weight or hollow-point appearance alone does not guarantee suitable terminal performance.

CM15 Billet Upper and Lower Receivers

The matched upper and lower receivers provide the rigid foundation for this 300 Blackout Hog Hunting Rifle. Both receivers are CNC-machined from 7075-T6 billet aluminum. Tight receiver fit and a rigid handguard interface contribute to the solid feel of the complete firearm.

• AR-15-compatible receiver dimensions
• CNC-machined 7075-T6 billet aluminum
• Pictogram-style fire and safe markings on both sides
• Lightened fire-control-group faces and magazine well
• Integral trigger guard for additional receiver strength
• Machined and flared magazine well
• Approximately 8-ounce stripped lower-receiver weight
• Cobalt Kinetics Green Cerakote

Ambidextrous CM15 Controls

The CM15 lower receiver provides ambidextrous controls that support operation from either shoulder and make the firearm easier to manage from unconventional field positions.

• CM ambidextrous safety selector
• CM ambidextrous magazine release
• CM15 ambidextrous bolt release
• CM15 pivot and takedown pins
• B5 Systems grip in Coyote

TriggerTech AR15 Duty Trigger Options

This 300 Blackout Hog Hunting Rifle includes the customer’s choice of three current TriggerTech AR15 Duty trigger configurations:

• Single-stage curved: 3.5-pound pull weight
• Single-stage straight: 3.5-pound pull weight
• Two-stage straight: 3.5-pound total pull weight

These TriggerTech Duty options replace the HiperFire triggers referenced in legacy CM15 descriptions and older product photographs. TriggerTech’s Frictionless Release Technology provides a crisp, consistent break without relying on traditional sliding friction at the engagement surfaces.

Adjustable Stock and Buffer System

The receiver extension assembly on this 300 Blackout Hog Hunting Rifle combines a Coyote B5 Systems SOPMOD stock with a CM mil-spec-diameter buffer tube finished in Cobalt Kinetics Green Cerakote.

• B5 Systems SOPMOD adjustable stock in Coyote
• CM mil-spec-diameter buffer tube
• Cobalt Kinetics Green Cerakote buffer-tube finish
• QD receiver end plate
• ODIN Works adjustable AR-15 buffer

The adjustable buffer is a secondary tuning control. CM first regulates the gas entering the operating system through the adjustable gas block, then uses buffer adjustment only when additional refinement is required. The objective is dependable operation using the lightest practical buffer and the minimum gas necessary to cycle the firearm.

CM15 Low-Mass Bolt Carrier Group

The CM15 low-mass bolt carrier group supports a responsive operating cycle while the adjustable gas block and buffer provide control over carrier speed.

• 9310 steel bolt
• High-pressure tested bolt
• Magnetic-particle-inspected bolt
• Nitride-coated bolt
• Nitride-coated carrier
• Nitride-coated gas key
• Gas key hardened to USGI specifications
• Grade 8 hardened gas-key fasteners
• Gas key properly staked
• Tool-steel extractor

The upper receiver also includes a CM15 ambidextrous charging handle manufactured from 7075 aluminum and a CM15 dust cover.

16-Inch 1:7 Twist CrMV Barrel

The barrel establishes this model as a conventional 300 Blackout Hog Hunting Rifle. Its 16-inch length avoids SBR classification while providing the handling characteristics some hunters prefer in a traditional stocked rifle.

• Caliber: .300 AAC Blackout / 300 BLK
• Barrel length: 16 inches
• Material: Chrome-moly vanadium steel
• Finish: Black nitride
• Twist rate: 1:7
• Crown: Shouldered crown
• Muzzle thread: 5/8×24
• Gas journal: 0.750 inch
• Gas-system length: Pistol

CM’s preferred general-purpose 300 Blackout configuration remains a 10–10.5-inch barrel with a 1:5 twist. The 16-inch barrel does not create a meaningful velocity advantage for CM’s intended subsonic application. It exists for customers who prioritize conventional rifle classification and full-length handling.

Why a 16-Inch Barrel Still Uses Pistol-Length Gas

Barrel length alone does not determine the correct gas-system location. Chattahoochee Munitions uses pistol-length gas on every conventional CM15 300 BLK barrel—including the 16-inch configuration—because the firearm must retain the pressure required to cycle subsonic ammunition.

A longer carbine- or rifle-length gas system would move the gas port farther from the chamber and reduce the pressure available from lower-energy subsonic loads. The pistol-length system provides the required operating window, while the adjustable gas block controls the amount of gas allowed into the action.

Superlative Arms Adjustable Gas Block

A Superlative Arms 0.750-inch adjustable gas block is a requisite component of this CM15 300 Blackout Hog Hunting Rifle. It allows the operating system to be tuned for the selected ammunition and suppressor rather than forcing one fixed gas setting to accommodate every possible combination.

Even two subsonic loads can generate different pressure curves and cycling behavior. Supersonic ammunition creates more operating energy, while an enclosed suppressor retains additional pressure and may require the gas block to be closed substantially.

Read the complete CM 300 Blackout Gas System Guide for the factory tuning philosophy, single-round test procedure, desired ejection pattern and troubleshooting sequence.

Factory Test-Fired and Verified

Every CM 300 Blackout Hog Hunting Rifle is test-fired and verified for proper operation before shipment. During manufacturing, CM confirms gas-block alignment, evaluates barrel gas-port sizing and establishes functional cycling.

Common issues such as a misaligned gas block or undersized barrel gas port are addressed during the manufacturing process. Later adjustment allows the owner to optimize the verified firearm for a particular load and suppressor; it is not a substitute for incomplete factory setup.

15-Inch CM15 LWS Handguard

The 15-inch CM15 LWS handguard gives the 300 Blackout Hog Hunting Rifle a continuous top rail and extensive accessory space while protecting the pistol-length gas system beneath it.

• 6061 aluminum construction
• Cobalt Kinetics Green Cerakote
• Dual-taper attachment system
• Steel barrel nut
• QD sling interfaces at the 3 and 9 o’clock positions
• M-LOK interfaces along the sides and bottom
• Full-length Picatinny top rail
• B5 Systems rail covers in Coyote

Muzzle Device and Suppressor Options

The 5/8×24 muzzle thread allows this 300 Blackout Hog Hunting Rifle to accept compatible .30-caliber muzzle devices and suppressor mounts. Available options may include direct-thread devices and mounting systems from established suppressor manufacturers. Some selections may change the final price.

Product photographs may show a muzzle device that is no longer the default selection. The device shown in a photograph does not limit the currently available options. The customer should select a device compatible with the intended suppressor and mounting system.

An enclosed suppressor is generally CM’s preferred choice for a subsonic-focused 300 BLK firearm. Its backpressure can provide useful operating energy with subsonic ammunition. A flow-through suppressor is more naturally suited to supersonic-focused cartridges because it reduces the backpressure that subsonic 300 BLK may need for dependable cycling.

When supersonic ammunition is fired through an enclosed suppressor, the gas block may need to be restricted substantially. The enclosed suppressor retains pressure while the supersonic load already provides more operating energy.

CM15-SD Versus Suppressor-Ready

This conventional 16-inch CM15 is suppressor-ready, but it is not an SD configuration. Within the CM product family, SD means the suppressor extends inside or beneath the handguard or forend.

On this rifle, the selected suppressor mounts forward of the 15-inch handguard. A suppressor is not included unless specifically identified as part of the selected product configuration.

Subsonic and Supersonic Hunting Ammunition

The CM15 can use compatible subsonic and supersonic 300 BLK ammunition, but the two categories provide different trajectories, pressure curves and terminal-performance envelopes.

• Subsonic ammunition: Prioritizes reduced sound with an enclosed suppressor and typically uses heavier projectiles.
• Supersonic ammunition: Provides higher velocity and may be the more practical choice where additional trajectory or terminal-performance margin is required.

A 300 Blackout Hog Hunting Rifle should be tested with the exact ammunition, magazine and suppressor combination intended for field use. Confirm zero, accuracy, feeding, cycling and final-round bolt lockback before hunting.

Read the CM 300 Blackout Subsonic Guide for more information about barrel length, twist rate and projectile selection. Black Butterfly Ammunition also offers 300 AAC Blackout ammunition for different applications.

CM-Vetted ETS Magazine

This rifle includes one CM-vetted ETS 30-round magazine. Its carbon-smoke polymer body provides visual access to the ammunition and helps distinguish the magazine from magazines dedicated to other AR-15 cartridges.

Chattahoochee Munitions vets magazines with its firearms rather than assuming that every nominally compatible AR-15 magazine will control every .300 Blackout projectile profile correctly. Additional magazines are available through the CM15 300 Blackout magazine page.

Magazine-capacity and hunting regulations vary by jurisdiction. Hunters are responsible for selecting a lawful magazine configuration for the location and activity.

Complete Rifle Specifications

• Manufacturer: Chattahoochee Munitions
• Model: CM15
• Caliber: .300 AAC Blackout / 300 BLK
• Classification: Rifle
• Action: Direct-impingement semi-automatic
• Barrel length: 16 inches
• Barrel material: CrMV
• Barrel finish: Black nitride
• Twist rate: 1:7
• Gas system: Pistol length
• Gas block: Superlative Arms 0.750-inch adjustable
• Muzzle thread: 5/8×24
• Trigger: TriggerTech AR15 Duty; curved, straight or two-stage straight
• Trigger pull: 3.5 pounds; 3.5-pound total pull for the two-stage option
• Handguard: CM15 LWS 15-inch M-LOK
• Stock: B5 Systems SOPMOD
• Buffer: ODIN Works adjustable AR-15 buffer
• Included magazine: One CM-vetted ETS 30-round magazine
• Finish: Cobalt Kinetics Green and Coyote
• Overall length: 33.25–36.50 inches
• Weight: 6 pounds 8 ounces with unloaded magazine and no accessories
• Length of pull: 11.25–14.50 inches

Note: Weight and dimensions shown in the separate WooCommerce information tab are for shipping purposes. The specifications above describe the firearm.

Warranty

This CM15 is covered by the Chattahoochee Munitions limited lifetime warranty. Coverage is limited to the original purchaser and is subject to the applicable functional-performance and original-configuration terms.

Frequently Asked Questions

Why use a CM15 for hog hunting?

The CM15 provides semi-automatic operation and immediate follow-up capability. Its adjustable gas system can be tuned around the selected hunting ammunition and suppressor.

Does the 16-inch barrel provide more useful velocity than a 10.5-inch barrel?

CM does not see a meaningful velocity advantage beyond approximately 10.5 inches for the cartridge’s intended subsonic application. The 16-inch configuration exists primarily for customers who prefer a conventional rifle.

Why does a 16-inch 300 BLK rifle use pistol-length gas?

Pistol-length gas provides the pressure required to cycle subsonic ammunition. The adjustable gas block then limits excess gas when the rifle uses higher-pressure ammunition or an enclosed suppressor.

Does the rifle include the muzzle device shown in the photographs?

Not necessarily. Photographs may show a previous muzzle device. Customers can select from the compatible 5/8×24 muzzle-device and suppressor-mount options currently offered by CM.

Does the rifle include a suppressor?

No. The 5/8×24 muzzle thread accepts compatible mounts and suppressors, but a suppressor is not included unless specifically identified in the selected configuration.

Is this an SD firearm?

No. It is suppressor-ready, but the suppressor mounts forward of the handguard. CM reserves the SD designation for configurations in which the suppressor extends inside or beneath the handguard.

Which trigger options are available?

Customers may select a TriggerTech AR15 Duty curved, straight or two-stage straight trigger. Each option has a 3.5-pound pull; the two-stage trigger has a 3.5-pound total pull weight.

Which magazine is included?

The rifle includes one CM-vetted ETS 30-round magazine. Local hunting or magazine-capacity regulations may require a different lawful capacity.

Is every CM15 test-fired?

Yes. Every CM semi-automatic firearm is test-fired and verified for proper operation before shipment. Gas-block alignment, gas-port sizing and baseline tuning are addressed during manufacturing.

A Purpose-Manufactured Semi-Automatic Hunting Rifle

The CM15 300 Blackout Hog Hunting Rifle combines conventional rifle classification, semi-automatic operation and a fully adjustable gas-and-buffer system. Its 16-inch 1:7 twist CrMV barrel, billet receivers, TriggerTech Duty trigger, CM-vetted ETS magazine and CM-verified operation create a dependable field firearm for hunters who understand that ammunition, magazine and suppressor selection must function as one complete system.