243 AR Rifle — CM10 FDE Metallic
The 243 AR Rifle from Chattahoochee Munitions brings the established 243 Winchester cartridge to the CM10 large-frame semi-automatic platform. This FDE Metallic 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 is part of the Chattahoochee Munitions high-velocity rifle collection for predator hunting, varmint applications, and precision shooting.
CM10 243 AR Rifle — 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: FDE Metallic Cerakote
243 AR Rifle — Two Barrel Configurations
The CM10 243 Winchester offers two distinct 20-inch barrel options with different materials, profiles, and twist rates. Both feature Tactical Grey Cerakote and 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 particular bullet designs for either configuration.
TriggerTech Duty Trigger and CM10 Lower Components
The 243 AR Rifle includes a TriggerTech Duty trigger with three selectable configurations. Each 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
FDE Metallic Finish and B5 Systems Coyote Furniture
The CM10 FDE Metallic configuration features matching Cerakote on the upper and lower receivers, 15-inch handguard, and buffer tube. Coyote B5 Systems furniture provides the contrasting exterior components.
- 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: FDE Metallic 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 AR Rifle 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 features FDE Metallic 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: FDE Metallic 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 AR Rifle — 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 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 information on magazines and cartridge compatibility across the high-velocity CM10 collection, visit Predator Plains.
243 AR Rifle — 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 FDE Metallic 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: FDE Metallic Cerakote
- Handguard Finish: FDE Metallic Cerakote
- Buffer Tube Finish: FDE Metallic Cerakote
- Furniture Color: Coyote
- Warranty: Chattahoochee Munitions Limited Lifetime Warranty
Published dimensions and weight describe the rifle configuration. Shipping dimensions and 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 AR Rifle — Cartridge Education
The 243 Winchester is an established .243-caliber centerfire cartridge used for hunting, varmint applications, and target shooting. It shares its nominal projectile diameter with 6mm Creedmoor, although cartridge geometry and common rifle configurations differ.
Read our 6mm Creedmoor vs 243 Winchester Guide for a detailed comparison.
Explore the complete Predator Plains — High Velocity Systems collection for the other CM10 high-velocity cartridge families.
Frequently Asked Questions About the CM10 243 AR Rifle
What barrel options are available for the CM10 243 AR Rifle?
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 use 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 the FDE Metallic configuration?
The FDE Metallic version includes Coyote B5 Systems furniture, including the CPS Medium stock, pistol grip, and rail covers. The receivers, handguard, and buffer tube feature matching FDE Metallic 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 manufacturer 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 cartridge families.
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