8.6 BLK Bolt Action Pistol | CM7S Compact 8″ FDE Metallic
The CM7S 8.6 BLK Bolt Action Pistol combines an 8-inch barrel with the Chattahoochee Munitions CM7S action, billet CM7 chassis, TriggerTech Primary trigger, telescoping Tailhook brace and vetted AICS-pattern magazine system. At just 5 lb 12 oz with an adjustable overall length of 20.50 to 28.0 inches, this is one of the most compact configurations in the CM7S 8.6 Blackout family.
Finished in FDE Metallic Cerakote with AI Dark Earth furniture, this configuration is built for customers who prioritize minimum overall length, particularly when a suppressor will become part of the complete firearm system.
CM offers both 1:3 and 1:5 twist options. With an 8-inch barrel, projectile construction, ammunition and velocity become particularly important, so the barrel should be configured around the load the firearm is intended to use.
A short-barreled rifle configuration with a telescoping shoulder stock is also available.
CM7S Bolt Action
At the center of the 8.6 BLK Bolt Action Pistol is the Chattahoochee Munitions CM7S action. The CM7S uses a Remington 700 footprint with a three-lug bolt and 60-degree throw in the same action architecture used throughout our bolt-action firearm family.
- Remington 700 footprint
- Three-lug bolt design
- 60-degree bolt throw
- M16-style extractor
- One-piece .718″ bolt body
- Wire EDM raceways
- Pinned 20 MOA Picatinny rail
- Large ejection port
- Lightweight action-body cutout
- .062″ firing pin
- Integrated .300″ recoil lug
- Tool-less fire-control removal
- Accepts Remington 700-style triggers
- 1-1/16″-16 barrel thread
- Side bolt-stop release
- Oversized bolt knob
- Spiral-fluted bolt
- Full PVD coating
- Action weight: 25 oz
The three-lug design and short 60-degree bolt lift complement the compact dimensions of the 8-inch firearm while retaining the familiar Remington 700 footprint.
8″ Mos-Tek 8.6 Blackout Barrel
This 8.6 BLK Bolt Action Pistol uses an 8-inch Mos-Tek premium bolt-action barrel manufactured from 416R stainless steel with 5R rifling.
- 8″ barrel length
- 416R stainless steel
- 5R rifling
- Choice of 1:3 or 1:5 twist
- Shouldered crown
- 5/8×24 muzzle threads
- Remage barrel-nut mounting system
- E100 Blackout Cerakote
CM offers both twist rates because projectile construction, length, weight, ammunition and velocity all influence stabilization. Rather than treating either twist as universally correct for 8.6 Blackout, we configure the barrel around the intended ammunition and application.
For a broader discussion of CM testing with barrel length, projectile weight, twist rate and suppression, see our 8.6 Blackout Subsonic Guide.
Why an 8″ 8.6 BLK Bolt Action Pistol?
The primary advantage of the 8-inch configuration is reduced overall length. The resulting 8.6 BLK Bolt Action Pistol measures approximately 20.50 inches at its shortest adjustment and weighs just 5 lb 12 oz.
That reduction becomes particularly useful when a suppressor is added. Beginning with an 8-inch barrel helps offset the additional length of the suppressor and keeps the complete system shorter than a conventional rifle-length host.
CM testing with subsonic 8.6 Blackout loads has shown approximately 12 to 12.5 inches to be a particularly useful barrel-length range for powder utilization in the loads we have evaluated. The 8-inch configuration makes a different tradeoff by prioritizing minimum overall length. Customers choosing between the two should consider barrel length, ammunition, projectile, twist rate and suppressor as parts of the complete system.
TriggerTech Remington 700 Primary Trigger
The CM7S 8.6 BLK Bolt Action Pistol is equipped with a TriggerTech Remington 700 Primary trigger, available in flat or curved configurations.
The Primary provides an adjustable pull-weight range of approximately 1.5 to 4.0 pounds. Because the CM7S accepts compatible Remington 700-style triggers, customers also retain additional trigger options if their requirements change.
CM7 Billet Chassis | FDE Metallic
The CM7 chassis is machined from billet aluminum and finished in FDE Metallic Cerakote. It provides a compact foundation for the CM7S while incorporating the magazine, accessory and rear-interface features of our longer bolt-action configurations.
- Flared AICS-pattern magazine well
- Ambidextrous magazine release
- Large trigger guard for gloved operation
- Machined billet-aluminum construction
- Modular rear adapter system
- M-LOK compatible
- Full-length bottom ARCA rail
- Dual integrated QD sling sockets
- Compatible with AR-15 pistol grips without integrated dovetails
The firearm also includes the CM Precision Vertical Crossover Grip, developed in collaboration with MK Machining and finished here in AI Dark Earth.
Telescoping Tailhook Brace
In its pistol configuration, the CM7S uses a telescoping Tailhook brace with an adjustable cheek riser. This rear configuration works with the short barrel to keep the firearm compact and adjustable.
The FDE Metallic chassis and AI Dark Earth furniture distinguish this model visually while leaving the mechanical configuration consistent with the other compact CM7S firearms.
Pistol or SBR Configuration
The primary configuration of this product is the 8.6 BLK Bolt Action Pistol with a telescoping Tailhook brace. Customers may alternatively select an SBR configuration equipped with a telescoping butt pad assembly and adjustable cheek riser.
When configured with the shoulder stock, the firearm is an NFA-regulated short-barreled rifle and must be transferred and possessed in accordance with applicable federal, state and local requirements.
Vetted AICS Magazine System
The CM7S uses an AICS-pattern magazine architecture. CM uses a vetted magazine configuration with its 8.6 Blackout bolt-action firearms so magazine compatibility is incorporated into the complete firearm system rather than left to customer experimentation.
Additional CM 8.6 Blackout Magazines are available for the bolt-action platform.
Compact Suppressor-Host Configuration
The 8-inch barrel gives this CM7S a fundamentally different role from our 12-inch and 16-inch configurations. This version prioritizes keeping the complete firearm as short and light as practical, especially when additional muzzle length will be added by a suppressor.
The bolt-action operating system also avoids the gas-system and buffer-system variables associated with cycling a semi-automatic firearm. Ammunition selection can therefore be approached independently from the requirements of a semi-automatic operating cycle.
The barrel terminates in standard 5/8×24 muzzle threads for appropriately configured muzzle devices and suppressor mounting systems. Compatibility should always be verified for the specific suppressor, ammunition and firearm configuration.
Choosing Between 1:3 and 1:5 Twist
CM has been building 8.6 Blackout firearms since the cartridge’s early introduction, before SAAMI standardization. Our experience has reinforced that twist selection should be considered alongside projectile design, weight, velocity and barrel length.
Across our longer 12- to 12.5-inch configurations, 1:5 has generally performed well with projectiles around 300 grains or less, while 1:3 has generally been better suited to heavy subsonic projectiles around 323 grains and above. An 8-inch barrel changes the velocity environment, making selection around the actual intended ammunition especially important.
CM therefore offers both twist options rather than presenting either one as universally correct.
For customers prioritizing minimum overall size, the 8.6 BLK Bolt Action Pistol combines an 8-inch barrel, CM7S action, adjustable Tailhook brace and billet chassis into an exceptionally compact 8.6 Blackout package.
To compare this firearm with our 12-inch and 16-inch CM7S configurations, CM10 AR10 platforms, barreled actions and supporting components, visit Area 8.6.
CM7S 8.6 BLK Bolt Action Pistol Specifications
| Platform | CM7S Bolt Action |
|---|---|
| Caliber | 8.6 Blackout |
| Primary Configuration | Pistol |
| Optional Configuration | Short-Barreled Rifle (SBR) |
| Barrel Length | 8″ |
| Barrel Manufacturer | Mos-Tek |
| Barrel Material | 416R Stainless Steel |
| Rifling | 5R |
| Twist Rate | 1:3 or 1:5 |
| Muzzle Threads | 5/8×24 |
| Trigger | TriggerTech Remington 700 Primary |
| Magazine Pattern | AICS |
| Chassis Finish | FDE Metallic Cerakote |
| Furniture | AI Dark Earth |
| Pistol Rear Configuration | Telescoping Tailhook Brace with Adjustable Cheek Riser |
| SBR Rear Configuration | Telescoping Butt Pad with Adjustable Cheek Riser |
| Weight | 5 lb 12 oz |
| Overall Length | 20.50″ – 28.0″ |
| Length of Pull | 6.0″ – 13.5″ |
8.6 BLK Bolt Action Pistol FAQ
How compact is the CM7S 8″ pistol?
The 8-inch CM7S weighs 5 lb 12 oz and has an adjustable overall length of approximately 20.50 to 28.0 inches.
Is the 8″ CM7S available as an SBR?
Yes. In addition to the Tailhook-braced pistol configuration, an SBR configuration is available with a telescoping shoulder stock and adjustable cheek riser. The SBR configuration is subject to applicable federal, state and local requirements.
Why choose the 8″ barrel instead of the 12″ barrel?
The 8-inch configuration prioritizes minimum overall length. CM’s 12- to 12.5-inch configurations provide additional barrel length and have been a particularly useful range for powder utilization with the subsonic loads we have evaluated. The appropriate choice depends on the customer’s complete firearm, ammunition and suppressor configuration.
Should I select 1:3 or 1:5 twist?
The appropriate twist depends on projectile construction, weight, ammunition, velocity and barrel length. CM offers both options so the firearm can be configured around the intended load.
Can the 8″ CM7S be suppressed?
Yes. The barrel uses 5/8×24 muzzle threads for compatible muzzle devices and suppressor mounting systems. Compatibility should be verified for the specific suppressor, ammunition and firearm configuration.
What magazine does the CM7S use?
The CM7S uses an AICS-pattern magazine architecture. CM offers a vetted 8.6 Blackout Magazine for the bolt-action platform.
Where can I compare other CM 8.6 Blackout firearms?
Visit Area 8.6 to compare CM7S bolt actions, CM10 AR10 platforms, pistol and SBR configurations, barreled actions and supporting components.
NFA NOTICE: When this firearm is ordered with the shoulder-stock/SBR configuration, it is an NFA-regulated firearm and is subject to applicable federal, state and local requirements.
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