CM 338 ARC
Chattahoochee Munitions manufactures the CM15 338 ARC AR15 as complete factory firearms: 8.5-inch and 10.5-inch pistols or SBRs and 16-inch rifles. Every CM15 uses CNC-machined 7075-T6 billet receivers, a 416R stainless barrel in E100 Blackout Cerakote, a low mass bolt carrier group with a Type II spec 9310 steel bolt, and a 3.5 lb TriggerTech AR15 Duty trigger.
The CM15 is tuned for both subsonic and supersonic 338 ARC. A Superlative Arms adjustable gas block and an Odin Works adjustable buffer let one AR15 run the 307 gr subsonic load suppressed and supersonic loads unsuppressed. With subsonic ammunition, use an enclosed suppressor; with supersonic ammunition, a flow-through suppressor is recommended. See the full lineup in Containment Zone 338, and compare platforms in 338 ARC bolt action vs semi auto.
338 ARC AR15 Rifle Configurations
- 8.5-inch pistol or SBR, 1:5 twist: 5 lb 14 oz, 7.25-inch M-LOK handguard, in Black Tungsten, Cobalt Kinetics Green or FDE Metallic Cerakote. See the 338 ARC semi auto SBR.
- 10.5-inch pistol or SBR, 1:5 twist: 6 lb 10 oz, 9.5-inch M-LOK handguard, in the same three colors. See the 338 ARC AR15 SBR.
- 16-inch rifle, 1:8 twist: 6 lb 10 oz, 15-inch M-LOK handguard, no SBR registration. See the 338 ARC AR15 rifle.
- Uppers: complete CM15 338 ARC uppers in 8.5, 10.5 and 16 inches. See the 338 ARC upper.
- Magazine: every CM15 ships with a 10-round 410 stainless AR15-pattern magazine; spares are the 338 ARC AR15 magazine.
CM15 FAQ
Who makes a 338 ARC AR15?
Chattahoochee Munitions manufactures the CM15 in 338 ARC as 8.5 and 10.5-inch pistols or SBRs and 16-inch rifles, plus complete 338 ARC uppers.
What twist rate does the CM15 338 ARC use?
1:5 on the 8.5 and 10.5-inch barrels and 1:8 on the 16-inch. Read 338 ARC twist rate for the details.
Do standard AR15 magazines work with 338 ARC?
No. 338 ARC uses the wider .441-inch ARC case head, so it needs a 338 ARC magazine and a 6.5 Grendel Type II bolt.
Which barrel length should I choose?
Choose 10.5 inches for suppressed subsonic shooting, 8.5 inches for a smaller suppressed host, and 16 inches to add supersonic reach without SBR registration. Read 338 ARC barrel length.
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CM15
CM15 338 ARC 10.5″ AR15 Pistol or SBR – Black Tungsten Cerakote and Black
Price range: $1,785.91 through $1,975.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM15
CM15 338 ARC 10.5″ AR15 Pistol or SBR – Cobalt Kinetics Green Cerakote and Coyote
Price range: $1,785.91 through $1,975.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM15
CM15 338 ARC 10.5″ AR15 Pistol or SBR – FDE Metallic Cerakote
Price range: $1,785.91 through $1,975.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM 338 ARC
CM15 338 ARC 16″ AR15 Rifle – Black Tungsten Cerakote
Price range: $1,695.91 through $1,785.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM 338 ARC
CM15 338 ARC 16″ AR15 Rifle – Cobalt Kinetics Green Cerakote
Price range: $1,695.91 through $1,785.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM 338 ARC
CM15 338 ARC 16″ AR15 Rifle – FDE Metallic Cerakote
Price range: $1,695.91 through $1,785.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM15
CM15 338 ARC 8.5″ AR15 Pistol or SBR – Black Tungsten Cerakote
Price range: $1,785.91 through $1,975.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM15
CM15 338 ARC 8.5″ AR15 Pistol or SBR – Cobalt Kinetics Green Cerakote and Coyote
Price range: $1,785.91 through $1,975.91 Select options This product has multiple variants. The options may be chosen on the product page -
CM15
CM15 338 ARC 8.5″ AR15 Pistol or SBR – FDE Metallic Cerakote
Price range: $1,785.91 through $1,975.91 Select options This product has multiple variants. The options may be chosen on the product page
