CM10 243 Winchester 20″ AR10 – Cobalt Kinetics Green

243 AR10 — CM10 Cobalt Kinetics Green

The 243 AR10 from Chattahoochee Munitions brings the established 243 Winchester cartridge to the CM10 large-frame semi-automatic platform. This Cobalt Kinetics Green configuration combines a 20-inch barrel, precision-machined billet receivers, a TriggerTech Duty trigger, and a rifle-length adjustable gas system.

Available with two distinct barrel configurations, the CM10 offers a choice between a 1:8 twist 416R stainless steel SOCOM/HBAR barrel and a 1:10 twist 4150 CrMV medium-profile barrel.

Part of Predator Plains — High Velocity Systems, the CM10 243 Winchester belongs to the Chattahoochee Munitions collection of high-velocity rifles for predator hunting, varmint applications, and precision shooting.

CM10 243 AR10 — Billet Receiver System

The CM10 upper and lower receivers are CNC-machined from 7075-T6 billet aluminum. The receiver architecture follows applicable DPMS high-profile AR10-pattern component specifications.

Upper and Lower Receiver Specifications

• Platform: CM10 Large-Frame Semi-Automatic
• Receiver Material: 7075-T6 Billet Aluminum
• Receiver Pattern: DPMS High Profile
• Barrel Nut Interface: 16 TPI
• Upper Receiver: Lightweight Machined Profile Without Forward Assist
• Lower Receiver: Machined Magazine Well with Wide Flare
• Trigger Guard: Integral
• Safety Markings: Pictogram Fire/Safe Engravings on Both Sides
• Receiver Finish: Cobalt Kinetics Green Cerakote

243 AR10 — Two Barrel Configurations

The CM10 243 Winchester offers two distinct 20-inch barrel options. Each configuration uses a different combination of material, profile, and twist rate. Both are finished in Tactical Grey Cerakote and feature 5/8×24 muzzle threads.

Option 1 — 1:8 Twist Stainless Steel Barrel

• Chambering: 243 Winchester
• Barrel Length: 20 inches
• Material: 416R Stainless Steel
• Profile: SOCOM/HBAR
• Twist Rate: 1:8
• Muzzle Threads: 5/8×24
• Gas Journal: .750 inch
• Finish: Tactical Grey Cerakote

Option 2 — 1:10 Twist CrMV Barrel

• Chambering: 243 Winchester
• Barrel Length: 20 inches
• Material: 4150 CrMV
• Profile: Medium
• Twist Rate: 1:10
• Muzzle Threads: 5/8×24
• Gas Journal: .750 inch
• Finish: Tactical Grey Cerakote

Twist rate is one factor in projectile stabilization. Projectile length, construction, velocity, and environmental conditions also affect the suitability of individual bullet designs for either barrel configuration.

TriggerTech Duty Trigger and CM10 Lower Components

The 243 AR10 features a TriggerTech Duty trigger with three selectable configurations. Each option provides a 3.5 lb total pull weight.

• Trigger: TriggerTech AR Duty
• Option 1: Single-Stage Flat — 3.5 lb
• Option 2: Single-Stage Curved — 3.5 lb
• Option 3: Two-Stage Flat — 3.5 lb Total
• Safety: CM Ambidextrous Safety Selector
• Magazine Release: CM Ambidextrous
• Bolt Release: CM10 Ambidextrous
• Pins: CM10 Pivot and Takedown Pins
• Pistol Grip: B5 Systems Coyote

Cobalt Kinetics Green Finish and Coyote Furniture

The CM10 Cobalt Kinetics Green configuration features matching Cerakote across the upper and lower receivers, 15-inch handguard, and buffer tube. Coyote B5 Systems furniture complements the green exterior finish.

• Stock: B5 Systems CPS Medium — Coyote
• Pistol Grip: B5 Systems — Coyote
• Rail Covers: B5 Systems — Coyote
• Receiver Extension: CM Mil-Spec Buffer Tube
• Receiver Extension Finish: Cobalt Kinetics Green Cerakote
• Buffer: Odin Adjustable Buffer AR10
• Endplate: Quick-Detach Configuration

CM10 Bolt Carrier Group

The CM10 features a bolt carrier group with the following construction and component specifications:

• 9310 Steel Bolt
• High-Pressure Tested (HPT) Bolt
• Magnetic Particle Inspected (MPI) Bolt
• Shot-Peened Bolt
• Nitride-Coated Bolt and Carrier
• Nitride-Coated Gas Key
• Gas Key Hardened to USGI Specifications
• Grade 8 Hardened Gas Key Fasteners
• Staked Gas Key Fasteners
• Tool Steel Extractor
• T.E.A. Extractor Spring
• Black Extractor Insert
• Crane-Pattern O-Ring

Rifle-Length Gas System and 15-Inch Handguard

The CM10 243 AR10 features a rifle-length gas system with a Superlative Arms .750 adjustable gas block and an Odin Adjustable Buffer. Superlative Arms provides technical documentation describing the operation and adjustment features of its gas block systems.

The 15-inch CM10 LWS M-LOK handguard receives Cobalt Kinetics Green Cerakote matching the upper and lower receivers and buffer tube.

• Charging Handle: CM10 Ambidextrous, 7075 Aluminum
• Gas System: Rifle-Length
• Gas Tube: CM Rifle-Length, Melonite Finish
• Gas Block: Superlative Arms .750 Adjustable, Melonite Finish
• Handguard: CM10 LWS 15-Inch M-LOK
• Handguard Material: 6061 Aluminum
• Handguard Finish: Cobalt Kinetics Green Cerakote
• Barrel Nut: Steel
• Top Rail: Full-Length Picatinny
• Accessory Interface: M-LOK Mounting Positions
• QD Attachment: 3 and 9 O’Clock Positions
• Rail Covers: B5 Systems Coyote

Muzzle-device selections are available through the product configuration menu. The muzzle device shown in product photographs may differ from the selected configuration.

243 AR10 — Magazine Compatibility

The CM10 243 Winchester includes one standard, unmodified 10-round Magpul PMAG 7.62 magazine.

The rifle uses the PMAG 10 LR/SR GEN M3 rather than the dedicated modified Amend2 magazine supplied with the CM10 22-250 Remington configurations.

• Manufacturer: Magpul
• Model: PMAG 10 LR/SR GEN M3
• Capacity: 10 Rounds
• Pattern: LR/SR
• Configuration: Factory, Unmodified
• Quantity Included: One

For additional information on magazine compatibility and high-velocity CM10 cartridge families, visit Predator Plains.

243 AR10 — Suppressor Considerations

For supersonic CM10 platforms, Chattahoochee Munitions generally recommends a flow-through or low-back-pressure suppressor.

Suppressor backpressure can influence operating-system characteristics in gas-operated semi-automatic firearms. The CM10 includes a Superlative Arms adjustable gas block and Odin Adjustable Buffer as part of its operating system.

Suppressor compatibility must be confirmed against the manufacturer’s cartridge ratings, barrel-length restrictions, bore specifications, and mounting requirements.

Supersonic projectiles continue to produce a ballistic shock wave even when a suppressor is used. Appropriate hearing protection remains recommended.

CM10 Cobalt Kinetics Green Dimensions and Warranty

• Overall Length: 41–43.5 inches
• Weight: 9 lb 8 oz with Unloaded Magazine
• Length of Pull: 14–17.5 inches
• Receiver Finish: Cobalt Kinetics Green Cerakote
• Handguard Finish: Cobalt Kinetics Green Cerakote
• Buffer Tube Finish: Cobalt Kinetics Green Cerakote
• Furniture Color: Coyote
• Warranty: Chattahoochee Munitions Limited Lifetime Warranty

Published dimensions and weight describe the rifle configuration. Shipping dimensions and shipping weight shown elsewhere on the product page may differ.

The limited lifetime warranty applies to the original purchaser, subject to Chattahoochee Munitions’ published warranty terms and exclusions.

243 AR10 — Cartridge Education

The 243 Winchester has a long history as a .243-caliber centerfire cartridge used for hunting, varmint applications, and target shooting. It shares its nominal projectile diameter with the newer 6mm Creedmoor, although cartridge geometry and common rifle configurations differ.

Read our 6mm Creedmoor vs 243 Winchester Guide for a detailed cartridge comparison.

Explore Predator Plains — High Velocity Systems for the CM10 22 Creedmoor, 22-250 Remington, 6mm Creedmoor, and 243 Winchester cartridge families.

Frequently Asked Questions About the CM10 243 AR10

What barrel options are available for the CM10 243 AR10?

The CM10 offers two 20-inch barrel configurations: a 1:8 twist 416R stainless steel SOCOM/HBAR barrel and a 1:10 twist 4150 CrMV medium-profile barrel. Both feature 5/8×24 muzzle threads, a .750 gas journal, and Tactical Grey Cerakote.

Does the CM10 243 Winchester require a modified magazine?

No. The CM10 243 Winchester includes one standard, unmodified Magpul PMAG 10 LR/SR GEN M3 magazine.

What TriggerTech options are available?

The rifle offers TriggerTech Duty single-stage flat, single-stage curved, and two-stage flat configurations. All three provide a 3.5 lb total pull weight.

Does the CM10 have an adjustable gas system?

Yes. The rifle has a rifle-length gas system with a Superlative Arms .750 adjustable gas block and Odin Adjustable Buffer.

What furniture comes with Cobalt Kinetics Green?

The Cobalt Kinetics Green version includes Coyote B5 Systems furniture, including the CPS Medium stock, pistol grip, and rail covers. The receivers, handguard, and buffer tube feature matching Cobalt Kinetics Green Cerakote.

What suppressor type does CM recommend?

Chattahoochee Munitions generally recommends a compatible flow-through or low-back-pressure suppressor for its supersonic CM10 rifles, subject to the suppressor manufacturer’s ratings and restrictions.

Where can I compare 243 Winchester and 6mm Creedmoor?

Visit our 6mm Creedmoor vs 243 Winchester Guide for technical information about both cartridges.