6mm ARC bolt action vs semi auto: the bolt action gives an adjustable precision trigger, no action noise when suppressed and a 12.5-inch compact option; the semi auto gives fast follow-up shots and a lighter rifle at the same barrel length. Chattahoochee Munitions manufactures both in 6mm ARC: the CM7S bolt action in 18-inch and 12.5-inch configurations, and the CM15 AR15 semi auto in 16-inch and 18-inch configurations. Every barrel is 1:7 twist with 5/8×24 threads and E100 Blackout Cerakote, so the choice is about how you shoot, not about the cartridge.
6mm ARC Bolt Action vs Semi Auto at a Glance
| Feature | CM7S bolt action | CM15 semi auto (AR15) |
|---|---|---|
| Barrel lengths | 18 and 12.5 inches | 16 and 18 inches |
| Barrel | Mos-Tek 416R stainless, 5R rifling, 1:7 | Fluted 416R stainless, 1:7 |
| Weight | 18 in: 7 lb 6 oz; 12.5 in: 6 lb 6 oz; 12.5 in walnut: 7 lb 12 oz | 16 in: 6 lb 6 oz; 18 in: 6 lb 12 oz |
| Trigger | TriggerTech Remington 700 Primary, 1.5 to 4.0 lb adjustable | TriggerTech AR15 Duty, 3.5 lb |
| Operation | Manual, Remington 700 footprint, three lugs, 60-degree throw | Gas operated; mid-length (16 in) or rifle-length (18 in) with adjustable gas block |
| Magazine | 10-round MDT AICS pattern | 10-round DURAMAG AR15 |
| Suppressor recommendation | Enclosed | Flow-through |
| Component options | 18 and 12.5-inch barreled actions | 16-inch complete upper |
When the 6mm ARC Bolt Action Fits
- Precision first: the adjustable TriggerTech Remington 700 Primary breaks from 1.5 lb, and the CM7 billet chassis has a full ARCA rail for bipods and tripods.
- Suppressed shooting: a bolt action adds no action noise, so the only sounds left are muzzle report and the bullet’s supersonic crack. Chattahoochee Munitions recommends an enclosed suppressor on the CM7S.
- Compact: only the bolt action comes with a 12.5-inch barrel, as a 6mm ARC short barreled rifle or pistol.
- Walnut: the 6mm ARC bolt action SBR pairs the 12.5-inch CM7S with WOOX walnut furniture.
- Your own stock: the 18-inch 6mm ARC barreled action and 12.5-inch 6mm ARC short barreled action fit Remington 700 short-action chassis and stocks.
CM7S barrels are manufactured in collaboration with Mos-Tek.
When the 6mm ARC Semi Auto Fits
- Follow-up shots: a second coyote, a running hog or several hogs in a sounder.
- Weight: the 18-inch CM15 weighs 6 lb 12 oz against 7 lb 6 oz for the 18-inch CM7S.
- DMR-style shooting: the 18-inch 6mm ARC DMR uses a rifle-length gas system for semi-automatic precision past 400 yards.
- Familiar controls: an AR15 with ambidextrous safety, magazine release, bolt release and charging handle.
- An upper for an existing lower: the 6mm ARC upper.
6mm ARC Bolt Action vs Semi Auto: Accuracy and Suppressors
Both platforms use the same 1:7 twist and the same ammunition, so 6mm ARC bolt action vs semi auto is rarely decided by accuracy alone. The bolt action’s adjustable trigger and fixed action make small groups easier for most shooters. The CM15’s Superlative Arms adjustable gas block and Odin adjustable buffer let you tune it for suppressed use. For a supersonic semi auto, Chattahoochee Munitions recommends a flow-through suppressor; see 6mm ARC suppressor.
6mm ARC Bolt Action vs Semi Auto by Use
| Use | Pick |
|---|---|
| Deer from a stand or blind | CM7S 18-inch, or 12.5-inch suppressed |
| Coyotes and hogs, multiple targets | CM15 16 or 18-inch |
| Steel and paper past 500 yards | CM7S 18-inch or CM15 18-inch DMR |
| Truck, UTV or tight cover | CM7S 12.5-inch |
See 6mm ARC barrel length, 6mm ARC for deer and 6mm ARC for coyotes and hogs, or compare every model at Overwatch 6.
More 6mm ARC Guides
- What is 6mm ARC?
- 6mm ARC rifle guide
- 6mm ARC ballistics
- 6mm ARC twist rate
- 6mm ARC barrel length
- 6mm ARC suppressor
- 6mm ARC for deer
- 6mm ARC for coyotes and hogs
- 6mm ARC vs 223
- 6mm ARC vs 6.5 Creedmoor
- 6mm ARC vs 243
- 6.5 Grendel vs 6mm ARC
- 22 ARC vs 6mm ARC
6mm ARC Bolt Action vs Semi Auto FAQ
Is a 6mm ARC bolt action more accurate than an AR15?
Both use the same 1:7 barrels and ammunition. The CM7S adjustable trigger and fixed action make small groups easier for most shooters, but a CM15 with good ammunition shoots well too.
Which is lighter, the CM7S or CM15 in 6mm ARC?
At 18 inches the CM15 is lighter: 6 lb 12 oz against 7 lb 6 oz. The 12.5-inch CM7S weighs 6 lb 6 oz.
Do the CM7S and CM15 use the same magazine?
No. The CM7S uses a 10-round MDT AICS-pattern magazine; the CM15 uses a 10-round DURAMAG AR15 magazine. Each complete firearm ships with one.
Which suppressor should I use on each?
Chattahoochee Munitions recommends an enclosed suppressor on the CM7S bolt action and a flow-through suppressor on the CM15.
Is there a 6mm ARC semi auto with a 12.5-inch barrel?
Not from Chattahoochee Munitions. The 12.5-inch length is offered on the CM7S bolt action.
What trigger does each platform use?
The CM7S uses a TriggerTech Remington 700 Primary, adjustable from 1.5 to 4.0 lb. The CM15 uses a TriggerTech AR15 Duty at 3.5 lb, straight, curved or two-stage straight.
Can I add a 6mm ARC upper to my AR15 lower?
Yes. The 16-inch CM15 6mm ARC upper fits a standard AR15 lower; use 6mm ARC magazines.
Who makes a 6mm ARC bolt action rifle?
Chattahoochee Munitions manufactures the CM7S 6mm ARC bolt action rifle with an 18-inch 1:7 Mos-Tek barrel, a 12.5-inch pistol or SBR, a walnut-stocked 12.5-inch SBR and 18 and 12.5-inch barreled actions.