The CM15 22 ARC SPR combines the high-velocity, supersonic performance of 22 ARC with Chattahoochee Munitions’ semi-automatic AR-15 platform. SPR, or Special Purpose Rifle, describes the precision-oriented role of this 18-inch configuration within the CM15 family. It uses CM’s billet receiver set, a fluted 416R stainless steel barrel, rifle-length gas system, adjustable gas block, adjustable buffer system, TriggerTech AR15 Duty trigger, and a CM-vetted 22 ARC AR15 magazine.
The 18-inch barrel places this rifle between the 16-inch and 20-inch CM15 configurations in Flight Deck 22. The combination of an 18-inch barrel, semi-automatic operation, rifle-length gas system, and adjustable operating components makes this a natural configuration for the Special Purpose Rifle concept.
This 22 ARC SPR is finished in Cobalt Kinetics Green Cerakote with Coyote furniture and controls. 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 SPR?
An 18-inch 22 ARC SPR occupies a useful position within the CM15 family. The Special Purpose Rifle concept emphasizes a precision-oriented AR-15 configuration while retaining semi-automatic operation, practical handling, and rapid follow-up capability.
The 18-inch barrel provides two additional inches compared with the 16-inch CM15 while remaining two inches shorter than our 20-inch rifles. This gives the SPR a distinct position within Flight Deck 22 without relying on arbitrary distance or effective-range claims.
The rifle uses a rifle-length gas system with a Superlative Arms adjustable gas block and ODIN Works adjustable heavy buffer. These components provide multiple points of adjustment within the operating system and complement the precision-oriented configuration of the 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 SPR. 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 Cobalt Kinetics Green 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: Cobalt Kinetics Green Cerakote
TriggerTech AR15 Duty Trigger
The 22 ARC SPR 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 is the current fire-control system used throughout the CM15 22 ARC family and complements the precision-oriented role of this 18-inch Special Purpose Rifle 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, Coyote
Adjustable Receiver Extension System
The rear of the rifle uses a B5 Systems Bravo stock in Coyote with a CM buffer tube finished in Cobalt Kinetics Green 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, Coyote
- Buffer tube: CM, Cobalt Kinetics Green Cerakote
- End plate: QD
- Buffer: ODIN Works Adjustable Heavy Buffer
CM15 Low-Mass Bolt Carrier Group
The CM15 22 ARC SPR 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 a defining component of this 22 ARC SPR. It is manufactured from 416R stainless steel, uses a fluted profile, and is finished in Black Cerakote.
Chattahoochee Munitions specifies a 1:8 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 SPR position of this CM15 within the Flight Deck 22 semi-automatic family. Customers can choose the 16-inch configuration when reduced overall length has greater priority or the 20-inch configuration when they prefer the longest barrel offered in the CM15 22 ARC family.
18-Inch Barrel Specifications
- Chambering: 22 ARC
- Length: 18″
- Material: 416R stainless steel
- Profile: Fluted
- Finish: Black Cerakote
- Twist: 1:8
- Crown: Shouldered
- Muzzle threads: 1/2×28
- Gas journal: .750″
- Gas system: Rifle length
Rifle-Length Adjustable Gas System
The 22 ARC SPR uses a Superlative Arms .750 Adjustable Gas Block with the rifle-length gas system.
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 SPR
The CM15 22 ARC SPR 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 Cobalt Kinetics Green 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: Cobalt Kinetics Green Cerakote
- Rail covers: B5 Systems, Coyote
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 SPR includes one 10-round CM-vetted DURAMAG in Coyote. 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 SPR Configuration
- Chambering: 22 ARC
- Configuration: Special Purpose Rifle (SPR)
- Platform: CM15 AR-15
- Operating system: Semi-automatic
- Receivers: 7075-T6 billet aluminum
- Receiver finish: Cobalt Kinetics Green Cerakote
- Barrel: 18″ fluted 416R stainless steel
- Barrel finish: Black Cerakote
- Twist: 1:8
- Muzzle threads: 1/2×28
- Gas journal: .750″
- Gas system: Rifle length
- Gas block: Superlative Arms .750 Adjustable, DLC Coyote
- 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: Cobalt Kinetics Green Cerakote
- Stock: B5 Systems Bravo, Coyote
- Grip: B5 Systems, Coyote
- Magazine: One 10-round CM-vetted 22 ARC AR15 DURAMAG, Coyote
- 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 SPR provides a precision-oriented Special Purpose Rifle 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 SPR FAQ
What does SPR mean?
SPR stands for Special Purpose Rifle. In the AR-15 context, the term is commonly associated with a precision-oriented rifle configuration that retains semi-automatic operation and practical handling. The 18-inch CM15 applies that concept to the 22 ARC cartridge.
Why choose an 18-inch 22 ARC SPR?
The 18-inch configuration sits between the 16-inch and 20-inch CM15 rifles. It gives the 22 ARC SPR additional barrel length over the 16-inch configuration without extending to the full 20-inch CM15 format.
Is the CM15 22 ARC SPR an AR15?
Yes. The CM15 22 ARC SPR is Chattahoochee Munitions’ semi-automatic AR-15 platform configured with an 18-inch 22 ARC barrel, billet 7075-T6 receivers, and AR-15 magazine architecture.
What barrel does the 18-inch CM15 use?
The rifle uses an 18-inch fluted 416R stainless steel barrel finished in Black Cerakote. It has a 1:8 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.
What gas system does the 18-inch CM15 use?
The 18-inch CM15 uses a rifle-length gas system with a Superlative Arms .750 adjustable gas block. The adjustable gas block works with the ODIN Works adjustable heavy buffer to provide multiple points of operating-system adjustment.
Is the 22 ARC SPR 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 CM15 use?
The CM15 uses the CM-vetted 22 ARC AR15 Magazine. One 10-round Coyote DURAMAG is included with the complete firearm.
How does the SPR differ from the 22 ARC DMR?
Both are precision-oriented CM15 configurations, but they represent different concepts within the 18-inch family. The 22 ARC SPR is positioned around the Special Purpose Rifle concept, while the Black Tungsten CM15 is positioned around the Designated Marksman Rifle concept. Both retain the semi-automatic CM15 AR-15 operating platform.
Where can I compare CM 22 ARC configurations?
Visit Flight Deck 22 for the complete product family or read the 22 ARC Rifle Guide for a deeper platform comparison.
Jeffrey Turner (verified owner) –