Skip to main content
PetLawn & GardenTruck & AutomotiveClothingPoultryHeating & CoolingHorseSporting GoodsOutdoor Power EquipmentFencing & GatesLivestockOutdoor LivingPet & Animal PharmacyToolsHome ImprovementFarm & RanchBoots & ShoesTrailers & TowingHome Decor & FurnitureWild Birds & WildlifeToysGift CardsServices Propane RefillTrailer RentalGarden CenterFeed CenterSame Day DeliveryPetVet ClinicPet WashGrooming at PetsenseDog Training at PetsenseTractor Supply RxPet InsuranceWag!

"Savings and Offers"

Weekly AdSaleClearance

"More Options"

Weekly AdWhat's NewTractor Supply AppEarn Rewards with Neighbor's ClubHometown HeroesLife Out Here BlogTSC Exclusive BrandsTop BrandsClearance ItemsBattery FinderOutdoor Power Equipment Parts FinderHitch Finder

Spend $49.99 to unlock Free Delivery on most orders

|
Learn More
Order statusTSC Credit CardsWhat’s newPetsenseWeekly Ad
​

Sign In / Enroll

Get rewarded!

​
Menu

Search

Home

Sign In

Cart
0.0
(0)
0.0 out of 5 stars.
A woman outside with a dog
A woman outside with a dog
  1. Home
  2. /
  3. Sporting Goods
  4. /
  5. Shooting
  6. /
  7. Shooting Accessories & Parts
  8. /
  9. Gun Parts
  10. /

  11. CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile

  1. Home
  2. /
  4. /
  5. Gun Parts

CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile

Shop all CMMG

  • New Arrival

CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile

Item # 609261099

CMMG CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile
CMMG CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile
$224.99
or
or

Notice:
This Item cannot be shipped to CA, CO, CT, IL, MA, NJ, NY, WA.
Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

Shop all CMMG

  • New Arrival

CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile

Item # 609261099

CMMG CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile
CMMG CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length with Multi Role Profile

$224.99
or
or
financeCard Logo
$38/mo.†  suggested payments with 6 Months Financing or earn $11 in Rewards+ on this purchase.

This item is available online only

Delivery to

Free standard delivery on online footwear & Clothing purchases of $49 and over.

​
Notice:
This Item cannot be shipped to CA, CO, CT, IL, MA, NJ, NY, WA.
Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

CMMG's Barrel Sub-Assembly is ideal for building your custom AR-15 upper group. It comes with properly installed M4 barrel extension. The barrel is constructed of 4140 chrome moly with a slat bath nitride finish and 5/8x24" threads.

  • CMMG's Barrel Sub-Assembly is designed for building a custom AR-15 upper group
  • Includes a properly installed M4 barrel extension
  • Barrel material: 4140 chrome moly steel
  • Finish: salt bath nitride
  • Threading: 5/8x24" threads
  • Firearm Fitment: AR-15
  • Barrel Features: Multi Role Profile, Threaded
  • Barrel Type: Carbine Length
  • Caliber: 300 Blackout
  • Color: Black
  • Finish: Nitride
  • Length: 16.10"
  • Length Range: 16"-20"
  • Material: 4140 Chromoly Steel
  • Sights: None
  • Thread Pattern: 5/8"x24
  • Twist: 1:7"
BrandCMMG
Country of OriginMade in USA
Ammunition CapacityN/A
CompatibilityAR-15
Gun CompatibilityRifles
Caliber.300 AAC Blackout
Gun Part TypeBarrels
Primary ColorBlack
Manufacturer Part Number30DF80A
No questions have been asked about this product.

No questions have been asked about this product.

Q&As

No questions have been asked about this product.

No questions have been asked about this product.

Similar Items

  1. CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length, Medium Taper Profile, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 16.10 in., 5/8 in. x 24 Thread, Carbine Length, Medium Taper Profile, Black

    $224.99
  2. CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 8 in., 5/8 in. x 24 Thread, Pistol Length with Medium Taper Profile, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 300 Blackout Barrel Sub-Assembly for AR-15, 8 in., 5/8 in. x 24 Thread, Pistol Length with Medium Taper Profile, Black
  3. CMMG 5.56x45mm NATO Barrel Sub-Assembly for AR-15, 16.10 in., 1/2 in. x 28 Thread, Carbine Length with M4 Profile, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 5.56x45mm NATO Barrel Sub-Assembly for AR-15, 16.10 in., 1/2 in. x 28 Thread, Carbine Length with M4 Profile, Black

    $224.99
  4. CMMG 350 Legend Barrel Sub-Assembly for AR-15, 16.10 in., 1/2 in. x 28 Thread, Carbine Length Gas System, Medium Taper
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 350 Legend Barrel Sub-Assembly for AR-15, 16.10 in., 1/2 in. x 28 Thread, Carbine Length Gas System, Medium Taper

    $224.99
  5. CMMG 8.6 Blackout Barrel Sub-Assembly, 12.50 in., 5/8 in. x 24 Thread, Black Nitride, 4140CM
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 8.6 Blackout Barrel Sub-Assembly, 12.50 in., 5/8 in. x 24 Thread, Black Nitride, 4140CM
  6. CMMG 22 LR Barrel Kit with Collar for AR-15, 16.10 in., 1/2 in. x 28 Thread, Black Nitride, Chromoly Steel
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 22 LR Barrel Kit with Collar for AR-15, 16.10 in., 1/2 in. x 28 Thread, Black Nitride, Chromoly Steel

    $249.99
  7. CMMG Resolute MK4 Upper for AR-Platform (No BCG or Charging Handle), 16.10 in., 300 Blackout, Armor Black, M-LOK Handguard
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Resolute MK4 Upper for AR-Platform (No BCG or Charging Handle), 16.10 in., 300 Blackout, Armor Black, M-LOK Handguard
  8. CMMG Bolt Rehab Kit for AR-15, 223 Rem/300 Blackout/5.56x45mm NATO, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Bolt Rehab Kit for AR-15, 223 Rem/300 Blackout/5.56x45mm NATO, Black

    $39.99
  9. CMMG 22 LR Barrel Kit for AR-15 with Bolt Carrier Group, 16.10 in., 1/2 in. x 28 Thread, Black Nitride, Chromoly Steel
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 22 LR Barrel Kit for AR-15 with Bolt Carrier Group, 16.10 in., 1/2 in. x 28 Thread, Black Nitride, Chromoly Steel
  10. CMMG Single-Stage Curved Trigger Kit for AR-15, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Single-Stage Curved Trigger Kit for AR-15, Black

    $34.99
  11. CMMG 33 Round 9mm Magazine for AR-15, Black, Polymer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 33 Round 9mm Magazine for AR-15, Black, Polymer

    $32.99
  12. CMMG Resolute Upper for AR-15 Platform, 16.10 in., 22 ARC, 7075-T6 Aluminum 15 in. M-LOK Handguard, Coyote Tan
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Resolute Upper for AR-15 Platform, 16.10 in., 22 ARC, 7075-T6 Aluminum 15 in. M-LOK Handguard, Coyote Tan

Items You May Like

  1. Lancer 20 Round 300 Blackout Magazine for AR-15
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Lancer 20 Round 300 Blackout Magazine for AR-15

    $19.99
  2. CMMG 30 Round 5.56mm Magazine for MK4/AR-15, Black, Polymer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 30 Round 5.56mm Magazine for MK4/AR-15, Black, Polymer

    $17.99
  3. CMMG Survival Kit Parts Kit for AR-15, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Survival Kit Parts Kit for AR-15, Black

    $64.99
  4. CMMG Bolt Assembly, Black, Aluminum
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Bolt Assembly, Black, Aluminum
  5. CMMG 10 Round 9mm Magazine for AR-15, Black, Polymer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 10 Round 9mm Magazine for AR-15, Black, Polymer

    $32.99
  6. CMMG 10 Round 5.7x28mm Magazine for MK4/AR-15
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 10 Round 5.7x28mm Magazine for MK4/AR-15

    $30.99
  7. CMMG 5.7x28mm Barrel and BCG Kit for AR-Platform, 5 in., Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 5.7x28mm Barrel and BCG Kit for AR-Platform, 5 in., Black
  8. CMMG 10 Round 338 ARC Magazine for AR-15, Black, Polymer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 10 Round 338 ARC Magazine for AR-15, Black, Polymer

    $33.99
  9. CMMG Zeroed HUB Mount, 5/8 in. x 24 Thread, Stainless Steel, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Zeroed HUB Mount, 5/8 in. x 24 Thread, Stainless Steel, Black

    $79.99
  10. CMMG Gen 2 32 Round 5.7x28mm Magazine for MK4/AR-15, Black, Polymer
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Gen 2 32 Round 5.7x28mm Magazine for MK4/AR-15, Black, Polymer

    $32.99
  11. CMMG Charging Handle Assembly for AR-15, 22 LR, Matte Black, Nylon
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Charging Handle Assembly for AR-15, 22 LR, Matte Black, Nylon

    $19.99
  12. CMMG Buffer Retainer for AR-15, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Buffer Retainer for AR-15, Black

    $3.99

Customers Also Bought

  1. CMMG 5.7x28mm Barrel Sub-Assembly for PS90 SBR, 10.40 in., M12x1 LH Thread, Medium Taper, Threaded
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG 5.7x28mm Barrel Sub-Assembly for PS90 SBR, 10.40 in., M12x1 LH Thread, Medium Taper, Threaded

    $324.99
  2. Wilson Combat 300 Blackout Match Grade Barrel for AR-15, 16 in., 5/8 in. x 24 Thread, Pistol Length with Threading
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Wilson Combat 300 Blackout Match Grade Barrel for AR-15, 16 in., 5/8 in. x 24 Thread, Pistol Length with Threading

    $284.99
  3. CMMG Resolute MK4 Upper for AR-Platform (No BCG or Charging Handle), 16.10 in., 5.56x45mm NATO, Armor Black, M-LOK Handguard
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Resolute MK4 Upper for AR-Platform (No BCG or Charging Handle), 16.10 in., 5.56x45mm NATO, Armor Black, M-LOK Handguard

    $609.99
  4. CMMG Dissent MK4 Upper for AR-Platform, 6.50 in., 300, Blackout, Left Side Charging Handle, Armor, Black, Zeroed Linear Comp
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Dissent MK4 Upper for AR-Platform, 6.50 in., 300, Blackout, Left Side Charging Handle, Armor, Black, Zeroed Linear Comp

    $1,399.99
  5. CMMG Resolute MK4 Upper for AR-Platform, 16.10 in., 350 Legend, Armor Black, M-LOK Free-Float Handguard
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Resolute MK4 Upper for AR-Platform, 16.10 in., 350 Legend, Armor Black, M-LOK Free-Float Handguard

    $949.99
  6. CMMG Barrel Nut for CMMG Free Float Handguards, Black, Steel
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Barrel Nut for Free Float Handguards, Black, Steel

    $29.99
  7. CMMG Receiver Extension Kit for AR-15 Pistol, Buffer Tube, Carbine Buffer, Ambi Sling Mount End Plate, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Receiver Extension Kit for AR-15 Pistol, Buffer Tube, Carbine Buffer, Ambi Sling Mount End Plate, Black

    $64.99
  8. Faxon Firearms 300 Blackout Barrel, 7.50 in., 5/8 in. x 24 Thread, Button Rifled, 416-R Stainless Steel
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Faxon Firearms 300 Blackout Barrel, 7.50 in., 5/8 in. x 24 Thread, Button Rifled, 416-R Stainless Steel
  9. Lead & Steel 300 Blackout Barrel, 10.50 in., 5/8 in. x 24 Thread, Government Profile, M4 Feed Ramps
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Lead & Steel 300 Blackout Barrel, 10.50 in., 5/8 in. x 24 Thread, Government Profile, M4 Feed Ramps
  10. CMMG Receiver Extension Kit for AR-15, includes Carbine Style Buffer & Action Spring
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG Receiver Extension Kit for AR-15, includes Carbine Style Buffer & Action Spring
  11. Ballistic Advantage 300 Blackout Modern Series Barrel for AR-15, 8 in., 5/8 in. x 24 Thread, DRP Profile, Threaded, Black QPQ
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    Ballistic Advantage 300 Blackout Modern Series Barrel for AR-15, 8 in., 5/8 in. x 24 Thread, DRP Profile, Threaded, Black QPQ

    $127.99
  12. CMMG QD End Plate for AR-15, Single Point, Black
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    CMMG QD End Plate for AR-15, Single Point, Black

    $7.99

Reviews

Review this Product

Select to rate the item with 1 star. This action will open submission form.
Select to rate the item with 2 stars. This action will open submission form.
Select to rate the item with 3 stars. This action will open submission form.
Select to rate the item with 4 stars. This action will open submission form.
Select to rate the item with 5 stars. This action will open submission form.
Be the first to review this product
Get the top deals, latest trends and more
Sign up for emails from Tractor Supply today.
First Name*
Last Name*
Email*

Customer Support

  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  

    (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

About Us

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

Work With Us

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

Neighbor's Club

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

Credit Center

  • TSC Credit Card

  • Klarna

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More
  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

  • TSC Credit Card

  • Klarna

Connect & Share with the Tractor Supply Community.

Shop on the go with the Tractor Supply App

Learn More
  • Privacy policy
  • Your Privacy Choices
  • Terms and Conditions
  • California Transparency Act
  • Legal Notices
  • Accessibility
  • Responsible Disclosure Statement
  • Surprise (Balance) Medical Billing Disclosure
  • Transparency in Coverage
  • Human Rights Policy
  • Vendor Code of Conduct
  • California Notice of Collection
  • Privacy Requests

© 2026, Tractor Supply Co. All Rights Reserved.