CM7S 338 ARC Bolt Action Rifle – 16″
The Chattahoochee Munitions 338 ARC Bolt Action Rifle combines the compact 338 ARC cartridge with the CM7S Remington 700-footprint action and a 16-inch MÔS-Tek barrel using CM’s 1:5 twist specification. This configuration is finished in Cobalt Kinetics Green Cerakote with AI Dark Earth accents.
The CM7S is Chattahoochee Munitions’ flagship bolt-action platform. It brings together our CM7S action, 338 ARC barrel specification, billet chassis, TriggerTech trigger, and a magazine already tested by CM for the cartridge. Rather than leaving the customer to determine component compatibility after purchase, the complete rifle is configured and tested as a system.
The 16-inch 338 ARC Bolt Action Rifle provides a conventional rifle-length configuration for customers who do not want the additional regulatory considerations associated with an SBR while retaining the heavy-projectile and subsonic capabilities that make 338 ARC particularly interesting.
CM7S Action – Full PVD Coated
The 338 ARC Bolt Action Rifle is built around the Chattahoochee Munitions CM7S action. The stainless-steel action uses a Remington 700 footprint with a three-lug bolt and 60-degree bolt throw.
- Remington 700 footprint
- 3-lug bolt design
- 60-degree bolt throw
- M16-style extractor
- One-piece .718″ diameter 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-pattern triggers
- 1-1/16″-16 barrel thread
- Side bolt-stop release
- Oversized bolt knob
- Spiral-fluted bolt
- Full PVD coating
- 25 oz action weight
16″ MÔS-Tek 338 ARC Barrel
The CM7S 338 ARC Bolt Action Rifle uses a 16-inch 416R stainless-steel barrel manufactured for Chattahoochee Munitions by MÔS-Tek. The barrel uses 5R rifling, a 1:5 twist, and the Remage barrel-nut system.
- 16″ barrel length
- 416R stainless steel
- 5R rifling
- 1:5 twist rate
- Shouldered crown
- 5/8×24 muzzle threads
- Remage barrel-nut system
- E100 Blackout Cerakote
Why CM Uses a 1:5 Twist
Chattahoochee Munitions specifies a 1:5 twist throughout the CM7S 338 ARC family. This differs from the 1:8 twist commonly associated with the standardized cartridge specification and is an intentional CM configuration.
CM has years of experience manufacturing and testing firearms using heavy .338-caliber projectiles. In our testing and experience, the faster twist has performed particularly well with heavy projectiles such as the 307-grain Hornady Sub-X.
That experience is one reason the 338 ARC Bolt Action Rifle uses the same 1:5 twist specification across CM7S barrel lengths rather than changing twist rate with each configuration.
TriggerTech Remington 700 Primary Trigger
The CM7S uses a TriggerTech Remington 700 Primary trigger and is available with either a flat or curved trigger. Pull weight is adjustable from 1.5 to 4.0 pounds.
TriggerTech’s Frictionless Release Technology provides a crisp break with short over-travel, while CLKR Technology allows external pull-weight adjustment. Hardened 440C stainless-steel internal components provide corrosion resistance and durability.
Some product photography may show earlier flat-trigger configurations equipped with trigger shoes. Current production triggers do not use those shoes.
CM7 Billet Aluminum Chassis
The complete 338 ARC Bolt Action Rifle is installed in the CM7 billet aluminum chassis, finished here in Cobalt Kinetics Green Cerakote.
- Machined from a single block of billet aluminum
- Flared AICS-pattern magazine well
- Ambidextrous magazine release
- Accepts AR-15 pistol grips without an integrated dovetail
- Large trigger guard for gloved operation
- Modular single-bolt stock adapter system
- M-LOK compatible
- Dual integrated QD sling sockets
- Full-length bottom ARCA rail
Stock, Grip and Magazine
Stock: Cobalt Kinetics Green Cerakote
Grip: CM Precision Vertical Crossover Grip developed in collaboration with MK Machining, finished in AI Dark Earth.
Magazine: One 10-round MDT polymer AICS-pattern magazine. Chattahoochee Munitions has tested this magazine with 338 ARC as part of the CM7S system.
Additional 338 ARC Bolt Action Magazines are available separately.
Why Choose a 338 ARC Bolt Action Rifle?
A 338 ARC Bolt Action Rifle combines the cartridge’s compact dimensions and heavy .338-caliber projectile capability with the simplicity of a manually operated action.
338 ARC is compact enough to operate within the AR-15 cartridge envelope, but the cartridge also presents an interesting combination of characteristics in a bolt-action platform. A manually operated action does not require ammunition to generate the gas necessary to cycle a semi-automatic operating system.
For shooters interested in heavy subsonic ammunition and suppressed use, this gives the bolt-action platform a different operating envelope. The CM7S also allows 338 ARC to be paired with the extensive Remington 700 ecosystem while CM handles the cartridge-specific elements of the rifle, including the barrel specification, bolt face, magazine selection, and complete-system configuration.
338 ARC Subsonic Capability
One of the primary reasons Chattahoochee Munitions builds the 338 ARC Bolt Action Rifle is the cartridge’s ability to operate with heavy .338-caliber subsonic projectiles.
CM’s 1:5 twist specification reflects our experience with these heavier projectiles. The rifle can also use appropriate supersonic 338 ARC ammunition, giving the cartridge both subsonic and supersonic capability from the same platform.
For a deeper technical discussion of the cartridge, barrel length, twist rate, suppression, and comparisons with 300 Blackout and 8.6 Blackout, read our 338 ARC Subsonic guide.
16″ 338 ARC Bolt Action Rifle Configuration
The 16-inch 338 ARC Bolt Action Rifle is the conventional rifle-length member of the CM7S 338 ARC family. Chattahoochee Munitions also offers shorter configurations for customers who place a greater priority on reducing overall firearm length.
In CM’s testing and loading experience with the configurations evaluated, much of the useful powder utilization occurs around the 12-inch range. The 16-inch configuration therefore is not offered on the premise that 338 ARC requires a long barrel. Instead, it provides a conventional rifle configuration for customers who prefer a 16-inch barrel and do not want to move into an SBR configuration.
CM7S 338 ARC Rifle Specifications
- Platform: CM7S bolt action
- Cartridge: 338 ARC
- Barrel: 16″ MÔS-Tek 416R stainless steel
- Rifling: 5R
- Twist: 1:5
- Muzzle Threads: 5/8×24
- Barrel Finish: E100 Blackout Cerakote
- Action: CM7S, full PVD coated
- Bolt Face: 6.5 Grendel Type II .449″
- Trigger: TriggerTech Remington 700 Primary, flat or curved
- Trigger Pull: 1.5–4.0 lb
- Chassis: CM7 billet aluminum
- Chassis/Stock Finish: Cobalt Kinetics Green Cerakote
- Magazine: 10-round MDT polymer AICS-pattern magazine
- Weight: 7 lb 4 oz
- Overall Length: 28.50″–36.00″
- Length of Pull: 6.0″–13.5″
Weights and dimensions shown elsewhere in the product data may represent shipping dimensions rather than the physical dimensions of the firearm.
Explore Containment Zone 338
This 338 ARC Bolt Action Rifle is one part of the larger Chattahoochee Munitions 338 ARC lineup. CM offers 338 ARC across both CM7S bolt-action and CM15 AR-15 platforms, including complete firearms, barreled actions, upper receivers, and tested magazines.
Explore the complete lineup in Containment Zone 338.
338 ARC Bolt Action Rifle FAQ
What twist rate does the CM7S 338 ARC Bolt Action Rifle use?
The CM7S 338 ARC Bolt Action Rifle uses a 1:5 twist. Chattahoochee Munitions selected this twist based on our experience with heavy .338-caliber projectiles, including subsonic projectiles.
What barrel is used on the 16″ CM7S?
The rifle uses a 16-inch 416R stainless-steel MÔS-Tek barrel with 5R rifling, a 1:5 twist, 5/8×24 muzzle threads, and E100 Blackout Cerakote.
What magazine does the CM7S 338 ARC use?
Chattahoochee Munitions supplies the rifle with a tested 10-round MDT polymer AICS-pattern magazine configured for the CM7S 338 ARC system.
Can the CM7S use Remington 700 components?
The CM7S uses a Remington 700 footprint and accepts Remington 700-pattern triggers, providing compatibility with a broad ecosystem of compatible rifle components.
Why choose the 16″ 338 ARC Bolt Action Rifle?
The 16-inch 338 ARC Bolt Action Rifle provides a conventional rifle-length configuration for customers who prefer that format or do not want the additional regulatory considerations associated with a short-barreled rifle.
Is 338 ARC suitable for subsonic ammunition?
Yes. Heavy subsonic ammunition is an important part of the 338 ARC cartridge’s capability and one of the reasons Chattahoochee Munitions uses a 1:5 twist in its CM7S rifles.
Reviews
There are no reviews yet.