The CM15 22 ARC DMR is an 18-inch AR15 configured around the Designated Marksman Rifle concept. It combines the high-velocity, supersonic performance of 22 ARC with Chattahoochee Munitions’ semi-automatic CM15 platform, an 18-inch fluted 416R stainless steel barrel, rifle-length gas system, adjustable gas block, adjustable buffer system, and TriggerTech AR15 Duty trigger.
DMR stands for Designated Marksman Rifle, a rifle concept that emphasizes precision-oriented capability while retaining a semi-automatic operating system and practical handling characteristics. The 18-inch CM15 is well suited to that role, sitting between CM’s 16-inch and 20-inch 22 ARC configurations.
This 22 ARC DMR is finished in Black Tungsten Cerakote with black B5 Systems furniture. It is a complete CM-manufactured firearm built around the CM15 receiver system and selected components for the 22 ARC cartridge.
Why an 18-Inch 22 ARC DMR?
The Designated Marksman Rifle concept occupies the space between a general-purpose carbine and a more specialized precision rifle. A DMR retains semi-automatic operation while emphasizing a configuration suitable for deliberate, precision-oriented shooting.
The 18-inch 22 ARC DMR fits naturally into that concept. The barrel is two inches longer than the compact 16-inch CM15 while remaining two inches shorter than the 20-inch rifles. That gives this configuration a distinct position within the Flight Deck 22 family without relying on arbitrary distance claims.
The rifle-length gas system, adjustable gas block, adjustable heavy buffer, low-mass bolt carrier group, and TriggerTech Duty trigger further support the configuration as a precision-oriented semi-automatic rifle.
For a deeper comparison of CM15 and CM7S platforms, barrel lengths, applications, and suppression considerations, read our 22 ARC Rifle Guide.
CM15 Billet Upper and Lower Receivers
The receiver set forms the foundation of the CM15 22 ARC DMR. Both receivers are CNC machined from 7075-T6 billet aluminum and manufactured around standard AR-15 component dimensions.
The lower receiver incorporates an integral trigger guard, flared machined magazine well, ambidextrous controls, and lightweight machining features. This configuration is finished in Black Tungsten Cerakote.
CM15 Receiver Features
- Material: CNC-machined 7075-T6 billet aluminum
- Platform: AR-15
- Safety markings: Pictogram-style Fire/Safe engravings on both sides
- Trigger guard: Integral
- Magazine well: Machined with wide flare
- Controls: Ambidextrous safety, magazine release, and bolt release
- Lower receiver weight: Approximately 8.0 oz.
- Finish: Black Tungsten Cerakote
TriggerTech AR15 Duty Trigger
The 22 ARC DMR is equipped with a TriggerTech AR15 Duty trigger with a 3.5-pound total pull weight. Customers can select a straight, curved, or two-stage straight trigger configuration.
The TriggerTech Duty provides the current fire-control system for the CM15 22 ARC family and complements the precision-oriented role of this 18-inch configuration.
Lower Receiver Components
- Trigger: TriggerTech AR15 Duty, 3.5 lb. total pull weight
- Trigger options: Straight, curved, or two-stage straight
- Safety: CM ambidextrous safety
- Magazine release: CM ambidextrous magazine release
- Bolt release: CM15 ambidextrous bolt release
- Pivot and takedown pins: CM15
- Grip: B5 Systems, Black
Adjustable Receiver Extension System
The rear of the rifle uses a B5 Systems Bravo stock in Black with a CM buffer tube finished in Black Tungsten Cerakote. A QD end plate provides an additional sling attachment point.
An ODIN Works Adjustable Heavy Buffer provides another tuning point within the CM15 operating system. Combined with the adjustable gas block, it allows gas delivery and reciprocating mass to be balanced as part of the complete rifle system.
Receiver Extension Components
- Stock: B5 Systems Bravo, Black
- Buffer tube: CM, Black Tungsten Cerakote
- End plate: QD
- Buffer: ODIN Works Adjustable Heavy Buffer
CM15 Low-Mass Bolt Carrier Group
The CM15 22 ARC DMR uses the CM15 low-mass bolt carrier group. The bolt is manufactured from 9310 steel and is high-pressure tested and magnetic-particle inspected.
The bolt, carrier, and gas key receive a nitride finish. The carrier incorporates lightening cuts, while the gas key uses hardened Grade 8 fasteners that are properly staked.
CM15 Bolt Carrier Group Specifications
- Bolt: 9310 steel
- Bolt testing: HPT and MPI
- Bolt finish: Nitride
- Carrier finish: Nitride
- Gas key finish: Nitride
- Gas key: Hardened to USGI specifications
- Fasteners: Grade 8 hardened
- Gas-key staking: Staked to specification
- Extractor: Tool steel
- Carrier: Lightening cuts
18-Inch Fluted 22 ARC Barrel
The 18-inch barrel is central to the configuration of this 22 ARC DMR. It is manufactured from 416R stainless steel, uses a fluted profile, and is finished in Black Cerakote.
Chattahoochee Munitions specifies a 1:7 twist rate for our 22 ARC barrels. The barrel also uses a shouldered crown, .750-inch gas journal, 1/2×28 muzzle threads, and a rifle-length gas system.
The 18-inch barrel helps define the DMR-oriented position of this rifle within the CM15 family. It provides additional barrel length over the 16-inch configuration without extending to the full 20-inch CM15 format.
18-Inch Barrel Specifications
- Chambering: 22 ARC
- Length: 18″
- Material: 416R stainless steel
- Profile: Fluted
- Finish: Black Cerakote
- Twist: 1:7
- Crown: Shouldered
- Muzzle threads: 1/2×28
- Gas journal: .750″
- Gas system: Rifle length
Rifle-Length Adjustable Gas System
The CM15 uses a Superlative Arms .750 Adjustable Gas Block with the rifle-length gas system. On this Black Tungsten configuration, the gas block has a Melonite finish.
The adjustable gas block works with the ODIN Works adjustable heavy buffer to provide two points of operating-system adjustment. Changes in ammunition, muzzle devices, and suppressor configurations can alter the amount of gas and energy acting on a semi-automatic rifle, making this adjustability a useful part of the CM15 system.
Suppressing the 22 ARC DMR
The CM15 22 ARC DMR is suppressor ready with 1/2×28 muzzle threads. Because the CM15 is a semi-automatic platform that relies on gas pressure to cycle its action, suppressor backpressure becomes part of the operating-system equation.
For the semi-automatic CM15, Chattahoochee Munitions generally favors a flow-through suppressor. Reducing additional backpressure can make it easier to maintain a balanced operating system while limiting unnecessary gas returned through the action.
The Superlative Arms adjustable gas block and ODIN Works adjustable heavy buffer provide additional tuning capability when the rifle is operated suppressed.
Flight Deck 22 is built around supersonic 22 ARC performance. A suppressor can substantially reduce muzzle blast, but it cannot eliminate the ballistic crack generated by a projectile traveling above the speed of sound.
CM15 15-Inch M-LOK Handguard
A 15-inch CM15 lightweight handguard surrounds the barrel and gas system. The handguard is machined from 6061 aluminum and finished in Black Tungsten Cerakote.
The attachment system uses a steel barrel nut and dual-taper interface. A full-length Picatinny top rail provides optics and accessory mounting space, while M-LOK interfaces are positioned along the sides and bottom.
Handguard Features
- Length: 15″
- Material: 6061 aluminum
- Attachment: Dual-taper system
- Barrel nut: Steel
- Top rail: Full-length Picatinny
- Accessory interface: M-LOK
- QD sockets: 3 and 9 o’clock positions
- Finish: Black Tungsten Cerakote
- Rail covers: B5 Systems, Black
Ambidextrous Charging Handle and Controls
The upper receiver includes a CM15 ambidextrous charging handle manufactured from 7075 aluminum, along with a dust cover and forward assist.
The ambidextrous charging handle complements the ambidextrous safety, magazine release, and bolt release in the lower receiver, providing accessible controls from either side of the rifle.
22 ARC AR15 Magazine
Each complete 22 ARC DMR includes one 10-round CM-vetted DURAMAG in Black. The CM15 uses an AR-15 magazine architecture rather than the AICS-pattern magazine used by the CM7S bolt-action platform.
Additional magazines are available through the CM 22 ARC AR15 Magazine product page.
CM’s validation applies to the magazine as used with our CM15 22 ARC firearms. Function with every possible combination of third-party receivers, uppers, barrels, or other components is not guaranteed by Chattahoochee Munitions.
Muzzle Device Options
Product photography may show the rifle with a Dead Air Keymo brake configured as a suppressor host. Available muzzle-device configurations can vary and may include an A2-style device or compatible suppressor-mount options.
Customers requiring a different muzzle device can contact Chattahoochee Munitions regarding availability and any applicable price adjustment.
Complete CM15 18-Inch DMR Configuration
- Chambering: 22 ARC
- Configuration: Designated Marksman Rifle (DMR)
- Platform: CM15 AR-15
- Operating system: Semi-automatic
- Receivers: 7075-T6 billet aluminum
- Receiver finish: Black Tungsten Cerakote
- Barrel: 18″ fluted 416R stainless steel
- Barrel finish: Black Cerakote
- Twist: 1:7
- Muzzle threads: 1/2×28
- Gas journal: .750″
- Gas system: Rifle length
- Gas block: Superlative Arms .750 Adjustable, Melonite
- Buffer: ODIN Works Adjustable Heavy Buffer
- Bolt: 9310 steel, HPT/MPI
- Trigger: TriggerTech AR15 Duty, 3.5 lb. total pull weight
- Trigger options: Straight, curved, or two-stage straight
- Handguard: CM15 15″ M-LOK
- Handguard finish: Black Tungsten Cerakote
- Stock: B5 Systems Bravo, Black
- Grip: B5 Systems, Black
- Magazine: One 10-round CM-vetted 22 ARC AR15 DURAMAG, Black
- Overall length: 35.50″–38.75″
- Weight: 6 lb. 12 oz. with unloaded magazine and no accessories
- Length of pull: 11″–14.25″
- Warranty: Limited Lifetime Warranty
Part of the Flight Deck 22 Ecosystem
The 18-inch 22 ARC DMR gives the CM15 family a precision-oriented semi-automatic configuration within Flight Deck 22. The 16-inch CM15 provides a shorter alternative, while the 20-inch rifles occupy the full-length side of the CM15 family.
Flight Deck 22 also includes the manually operated CM7S family, CM7S barreled actions, a CM15 upper, and dedicated CM-vetted magazines for both operating platforms.
For help comparing CM15 and CM7S configurations, visit the 22 ARC Rifle Guide.
22 ARC DMR FAQ
What does DMR mean?
DMR stands for Designated Marksman Rifle. The concept generally describes a precision-oriented semi-automatic rifle that retains practical handling and rapid follow-up capability. The 18-inch CM15 applies that configuration concept to the 22 ARC cartridge.
Why use an 18-inch barrel for the CM15 22 ARC DMR?
The 18-inch configuration sits between CM’s 16-inch and 20-inch CM15 rifles. It provides additional barrel length over the compact 16-inch configuration without extending to the full 20-inch format.
Is the CM15 22 ARC DMR an AR15?
Yes. The CM15 22 ARC DMR is built on Chattahoochee Munitions’ semi-automatic AR-15 platform with billet 7075-T6 receivers, an 18-inch 22 ARC barrel, and an AR-15 magazine architecture.
What barrel does the 22 ARC DMR use?
The rifle uses an 18-inch fluted 416R stainless steel barrel finished in Black Cerakote. It has a 1:7 twist, shouldered crown, .750-inch gas journal, 1/2×28 muzzle threads, and a rifle-length gas system.
What trigger is installed in the CM15?
The rifle uses a TriggerTech AR15 Duty trigger with a 3.5-pound total pull weight. Customers can select a straight, curved, or two-stage straight trigger configuration.
What steel is used for the CM15 bolt?
The CM15 bolt is manufactured from 9310 steel and is high-pressure tested and magnetic-particle inspected.
Is the 22 ARC DMR suppressor ready?
Yes. The barrel is threaded 1/2×28. Chattahoochee Munitions generally favors a flow-through suppressor for the semi-automatic CM15 to help manage additional gas and backpressure.
Will a suppressor eliminate the supersonic crack?
No. Flight Deck 22 is built around supersonic 22 ARC performance. A suppressor reduces muzzle blast but does not eliminate the ballistic crack produced by a supersonic projectile.
What magazine does the 22 ARC DMR use?
The CM15 uses the CM-vetted 22 ARC AR15 Magazine. One 10-round black DURAMAG is included with the complete firearm.
Where can I compare the 22 ARC DMR with other CM configurations?
Visit Flight Deck 22 for the complete product family or read the 22 ARC Rifle Guide for a deeper comparison of CM15 and CM7S configurations.
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