4.6 rating with 5 reviews
CMMG, Inc 16in 300 ACC BLK, Carb Gas, 30DF80A
CMMG, Inc CMM MC 4140CM .300 AAC Blackout, 8 in Medium Tapered Profile Barrel, 5/8-24 Threads, Salt Bath Nitride Finish, 30D810A
CMMG, Inc CMM Multi Role Profile Barrel Sub-Assembly 4140CM .300 AAC Blackout, 12.5in, 5/8-24 Threads, Salt Bath Nitride Finish, 30D8A0A
CMMG, Inc MK4 MT 4140CM .300 AAC Blackout 16.1in Barrel Medium Taper Profile, 5/8-24 TPI, Salt Bath Nitride Finish, 30D120A
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
CMMG, Inc 16in 300 ACC BLK, Carb Gas, 30DF80A
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
1 of 10 images
CMMG, Inc 16in 300 ACC BLK, Carb Gas, 30DF80A
2 of 10 images
CMMG, Inc CMM MC 4140CM .300 AAC Blackout, 8 in Medium Tapered Profile Barrel, 5/8-24 Threads, Salt Bath Nitride Finish, 30D810A
3 of 10 images
CMMG, Inc CMM Multi Role Profile Barrel Sub-Assembly 4140CM .300 AAC Blackout, 12.5in, 5/8-24 Threads, Salt Bath Nitride Finish, 30D8A0A
4 of 10 images
CMMG, Inc MK4 MT 4140CM .300 AAC Blackout 16.1in Barrel Medium Taper Profile, 5/8-24 TPI, Salt Bath Nitride Finish, 30D120A
5 of 10 images
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
6 of 10 images
CMMG, Inc 16in 300 ACC BLK, Carb Gas, 30DF80A
7 of 10 images
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
8 of 10 images
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
9 of 10 images
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
10 of 10 images
CMMG, Inc Barrel Sub-Assembly, 16.1in. MT 416SS, 300 BLK 30DC30A
Tap Tap to Zoom
Government Export Restriction
Government Restriction
You May Also Like
Questions & Answers
Is this barrel dimpled? Expert Answer
The CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly does not have a dimpled barrel. This barrel has a 0.750" gas journal and utilizes M4 feed ramps. It is machined from 4140 chrome moly steel with a nitride finish.
by Ethan, Gear Expert, March 9, 2022
See 3 More Answers
What is the gas system length on the 12.5” Expert Answer
The 12.5" under MPN:30D8A0A is a pistol length gas system barrel.
by Armando R., Gear Expert, March 30, 2022
You Have a Question? Ask!
Customer Reviews
Helpful Positive Review Great Barrel by JoePa, Verified Owner, January 13, 2021
I am using this in a pistol configuration. It is amazing. Using this barrel with a Yankee hill machine resonator and it functions flawlessly. Ran supersonic and subsonic ammunition without any problems.
7/8 found this helpful
Helpful Positive Review CMMG 16" 300 BLK Barrel by Josh, Verified Owner, September 22, 2018
Awesome barrel that gives me the accuracy I need for my custom build. It can be difficult to find the sweet spot of accuracy vs cost when shopping for AR barrels but this one seems to have found it for me.
6/6 found this helpful
Helpful Positive Review 12.5" cmmg barrel by Russ, Verified Owner, November 12, 2021
As expected from CMMG. No rounds down yet. Note, this is a pistol length gas system. I double checked on cmmg's website. Optics planet is wrong. I already ordered carbine length and assembled it to the gas block. :-(
5/7 found this helpful
Helpful Negative Review If buying for Subs, you will struggle by Al, Verified Owner, July 19, 2023
I purchased this barrel strictly for a 300 sub build. I know the optimal length is shorter, but I wanted to build a 16 inch sub build. Even with an adjustable gas block, I have yet to cycle rounds. It will run supers pretty well if you dial in the ga...
Read More...
2/3 found this helpful
Most Recent Reviews Thanks CMMG by Jetster, December 10, 2023
I am particularly fond of 12.5" battle rifles and when it comes to building them in 300 blk I always turn to CMMG and their 12.5 multi role barrel for the build.Quality that I am confident in when it is all on the line.
0/1 found this helpful
Read All 5 Reviews
Related Reviews
CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly All CMMG, Inc Gun Parts Reviews All Gun Parts Reviews All CMMG Reviews All Customer Product Reviews
Blazin' Deal
Best Rated
We've got an AWESOME deal for you!
Prices have been cut drastically on select models of this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts - sorry about that. This offer won't last long, so don't miss out! See more Blazin' Deal items
In Stock
5 Models Available
Show with deals only:
Blazin' Deal
Color
All
Barrel Length
All
Barrel Profile
All
Search
Color: Black Barrel Length: 16.1 inBarrel Profile: Medium Taper
Code: 2CM-ATB-CQASE-30D120A
MPN: 30D120A
UPC: 815835016238
Save $11.96
$187.99
Color: Silver Barrel Length: 16.1 inBarrel Profile: Medium Taper
Code: 2CM-ATB-CQASE-30DC30A
MPN: 30DC30A
UPC: 815835016245
Save $10.46
$194.49
Color: Black Barrel Length: 16.1 inBarrel Profile: Multi Role
Code: 2CM-ATB-CQASE-CQASE-EE
MPN: 30DF80A
UPC: 815835011028
Blazin' Deal
Save 19%
$161.49
Color: Black Barrel Length: 8 inBarrel Profile: Medium Taper
Code: 2CM-ATB-CQASE-30D810A
MPN: 30D810A
UPC: 815835016283
Blazin' Deal
Save $12.95
$162.00
Color: Black Barrel Length: 12.5 inBarrel Profile: Multi Role
Code: 2CM-ATB-CQASE-30D8A0A
MPN: 30D8A0A
UPC: 815835062761
Blazin' Deal
Save 14%
$170.99
Click to select this item for your bundle offer!
Buy Together and Save
As low as $289.28
You Save Up to 18%
Receive
$3.89 OP Bucks
Free shipping* & free returns*
Product Info for CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly
Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
Features of CMMG, Inc 16inch 300 Acc Blkout 1:7 Carb Gas:
- 16.1"
- Multi Role Profile
- 4140 Chrome Moly
- Salt Bath Nitride Finish inside and out
- 1:7 Twist
- 300 AAC Blackout Chamber
- Threaded 5/8-24
- .750" Gas Journal
Specifications for CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly:
| Manufacturer: | CMMG |
| Finish: | Salt Bath Nitride |
| Cartridge: | .300 AAC Blackout |
| Threads per Inch: | 5/8x24 |
| Gun Model: | AR-15 |
| Condition: | New |
Package Contents:
- CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly
The CMMG, Inc 16inch 300 Acc Blkout 1:7 Carb Gas is a quality addition to the CMMG lineup. For more great deals on AR15 Barrels by CMMG, please browse our CMMG, Inc Gun Parts page.
Related Products to CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly
7 models CMMG DISSENT 9mm, 6.5in Upper Receiver As Low As (Save Up to 16%) $1,219.00 Blazin' Deal
6 models CMMG Mk4 5.7X28mm Resolute Upper Group Receiver (2) As Low As (Save Up to 20%) $799.00 Blazin' Deal
CMMG MkGs Resolute Upper Receiver Group $1,026.42
6 models CMMG Mk4 9mm Resolute Upper Group Receiver (1) As Low As (Save Up to 20%) $799.00 Blazin' Deal
7 models CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver As Low As (Save Up to 13%) $1,299.00 Blazin' Deal
3 models CMMG Mk47 7.62X39mm Resolute Upper Group Receiver As Low As (Save Up to 16%) $929.00 Blazin' Deal
12 models CMMG MkG .45 ACP Banshee Upper Group Receiver As Low As (Save Up to 15%) $779.99 Blazin' Deal
5 models CMMG 9mm 8in Banshee Upper Group Receiver (2) As Low As (Save Up to 17%) $769.49 Blazin' Deal
2 models CMMG 9mm 5in Barrel Barrel and BCG Kit (2) As Low As (Save Up to 19%) $365.99 Blazin' Deal
4 models CMMG Mk3 Endeavor Upper Receiver Group As Low As (Save Up to 17%) $999.00 Blazin' Deal
CMMG, Inc Thread Adapter, PS90 (1) $69.95 (Save 10%) $62.67 Blazin' Deal
12 models CMMG Mk4 .300BLK Banshee Upper Group Receiver As Low As (Save Up to 19%) $729.00 Blazin' Deal
5 models CMMG Mk4 Banshee Upper Receiver Group, w/Linear Compensator As Low As (Save Up to 17%) $683.00 Blazin' Deal
2 models CMMG, Inc Firing Pin Retainer (7) As Low As $0.86 Clearance
2 models CMMG, Inc 9mm Barrel and Bolt Carrier Group (BCG) Kit (12) As Low As (Save Up to 14%) $409.00 Blazin' Deal
3 models CMMG 22LR Mk4 Barrel Kits w/ Bolt Group (46) As Low As (Save Up to 19%) $264.99 Blazin' Deal
CMMG ZEROED AR15 Bolt Catch (5) $14.95 (Save 16%) $12.59 Clearance
3 models CMMG, Inc 22LR AR Conversion Kit, Mk57, w/ 3 Magazines, 10rd (3) As Low As (Save Up to 22%) $179.99 Blazin' Deal
7 models CMMG DISSENT Mk4, 5.56x45mm NATO, 6.5in Upper Receiver As Low As (Save Up to 19%) $1,179.00 Blazin' Deal
6 models CMMG Mk10 10mm Banshee Upper Group Receiver (1) As Low As (Save Up to 17%) $769.00 Blazin' Deal
3 models CMMG 57 X 28mm Barrel And Bcg Kit As Low As (Save Up to 22%) $349.00 Blazin' Deal
2 models Cmmg, Inc AR15, Ambi Magazine Catch w/Mag Release Button and Spring (15) As Low As (Save Up to 16%) $33.63
CMMG, Inc Auto Sear Trip And Anti -Bounce Weight Kit, .22 ARC (11) $54.95 (Save $3.76) $51.19
CMMG AR-15 ZEROED Lower Parts Kit (2) $146.99 (Save 15%) $125.34 Blazin' Deal
CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly Orderable Models
List of Orderable Models
CMMG, Inc Barrel Sub-Assembly, Medium Taper, 300 BLK, 16.1in, 4140CM, Salt Bath Nitride, 30D120A , MPN: 30D120A , UPC: 815835016238 , Code: 2CM-ATB-CQASE-30D120A
CMMG, Inc Barrel Sub-Assembly, Medium Taper, 300 BLK, 16.1in, 416SS, 30DC30A , MPN: 30DC30A , UPC: 815835016245 , Code: 2CM-ATB-CQASE-30DC30A
CMMG, Inc Barrel Sub-Assembly, Multi Role Profile, 300 BLK, 16.1in, 4140CM, Salt Bath Nitride, 30DF80A , MPN: 30DF80A , UPC: 815835011028 , Code: 2CM-ATB-CQASE-CQASE-EE
CMMG, Inc Barrel Sub-Assembly, Mediun Taper Profile, 300 BLK, 8in, 4140CM, Salt Bath Nitride, 30D810A , MPN: 30D810A , UPC: 815835016283 , Code: 2CM-ATB-CQASE-30D810A
CMMG, Inc Barrel Sub-Assembly, Multi Role Profile, 300 BLK, 12.5in, 4140CM, Salt Bath Nitride, 30D8A0A , MPN: 30D8A0A , UPC: 815835062761 , Code: 2CM-ATB-CQASE-30D8A0A
CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly Unavailable & Discontinued Models
List of Unorderable Models
DEMO, CMMG, Inc Barrel Sub-Assembly, Multi Role Profile, 300 BLK, 16.1in, 4140CM, Salt Bath Nitride, 30DF80A-DEMO , MPN: 30DF80A-DEMO , Code: 2CM-ATB-CQASE-CMMG30DF80A-DEMO
DEMO, CMMG, Inc Barrel Sub-Assembly, Mediun Taper Profile, 300 BLK, 8in, 4140CM, Salt Bath Nitride, 30D810A , MPN: 30D810A-DEMO , Code: 2CM-ATB-CQASE-30D810A-DEMO
DEMO, CMMG, Inc Barrel Sub-Assembly, Medium Taper, 300 BLK, 16.1in, 416SS, 30DC30A , MPN: 30DC30A-DEMO , Code: 2CM-ATB-CQASE-30DC30A-DEMO
DEMO, CMMG, Inc Barrel Sub-Assembly, Multi Role Profile, 300 BLK, 12.5in, 4140CM, Salt Bath Nitride, 30D8A0A , MPN: 30D8A0A-DEMO , Code: 2CM-ATB-CQASE-30D8A0A-DEMO
Compare (0)
1 item has been added
Add at least two items to compare
CMMG + Gun Parts CMMG, Inc Gun Parts CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly CMMG + Gun Parts CMMG, Inc Gun Parts + Rifle Parts CMMG, Inc Rifle Parts + Rifle Barrels CMMG, Inc Rifle Barrels CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly CMMG + Gun Parts CMMG, Inc Gun Parts + AR 15 Parts CMMG, Inc AR15 Parts + AR15 Barrels CMMG, Inc AR15 Barrels CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly CMMG + Gun Parts CMMG, Inc Gun Parts + Rifle Parts CMMG, Inc Rifle Parts + AR 15 Parts CMMG, Inc AR15 Parts + AR15 Barrels CMMG, Inc AR15 Barrels CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly CMMG + Gun Parts CMMG, Inc Gun Parts + AR 15 Parts CMMG, Inc AR15 Parts CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly CMMG + Gun Parts CMMG, Inc Gun Parts + Rifle Parts CMMG, Inc Rifle Parts + AR 15 Parts CMMG, Inc AR15 Parts CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly CMMG + Gun Parts CMMG, Inc Gun Parts + Rifle Parts CMMG, Inc Rifle Parts CMMG, Inc .300 AAC Blackout Barrel Sub-Assembly
