User Ratings
No ratings yet
Be the first to review this product
CMMG’s Barrel Sub-Assembly is built for builders who want a durable, accurate AR-15 upper foundation in hard-hitting .350 Legend. This 16.1-inch barrel is made from 4140 chromoly steel and treated with a black nitride (salt bath nitride) finish for corrosion resistance and long service life. It features a carbine-length gas system with a medium taper profile, and arrives with a properly installed M4 barrel extension to support reliable fitment and performance in compatible AR-15/Mk4 upper assemblies.
Product Highlights
- 16.1-inch .350 Legend AR-15 barrel sub-assembly ideal for custom builds or barrel replacement
- 4140 chromoly steel construction with black nitride (salt bath nitride) finish for enhanced durability
- Carbine-length gas system with medium taper profile for balanced handling
- Threaded muzzle (1/2x28) and 1:16 twist rate to match common .350 Legend setups
- Includes properly installed M4 barrel extension; factory headspaced (per published specs)
Specs
- Brand: CMMG
- Manufacturer Part Number: 35D5F0A
- UPC: 816422027477
- Caliber/Chamber: .350 Legend
- Barrel Length: 16.1 in
- Material: 4140 chromoly steel
- Finish: Black nitride / salt bath nitride (matte black)
- Gas System Length: Carbine
- Profile: Medium taper
- Twist Rate: 1:16
- Muzzle Thread: 1/2x28
- Gas Journal Diameter: 0.750 in
- Platform Compatibility: AR-15 (CMMG Mk4/AR-15 uppers)
- Barrel Extension: M4 (installed)
Specifications
- Manufacturer:
- Cmmg
- Category:
- barrel
- Caliber:
- .350 Legend
- Platforms:
- AR-15
- Interfaces:
- Muzzle thread: 1/2-28
- Weight:
- 32 oz (2.00 lbs)
- Length:
- 16.1"
- Estimated velocity:
- 1,500-2,200 fps
- UPC:
- 8229012406394
- MPN:
- 35D5F0A
- Required Component:
- Yes
Estimate only. Based on caliber + barrel length bucket. View details
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$217.98
Lowest
$199.95
Highest
$217.98
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertSimilar Products
Daniel Defense 16in 5.56mm NATO Carbine Length M4 Profile Barrel 07-075-08174-018
Daniel Defense
$289.99
Faxon Duty Series AR-15 Barrel 5.56x45mm NATO 10.5 Pencil Contour 1:8 Twist Black Nitride
Faxon Firearms
$132.40
14.5-inch 5.56 Government Profile Midlength AR 15 Barrel, Modern Series (OEM)
Ballistic Advantage
$170.00
Criterion Barrels Core AR-15 Barrel 223 Wylde 14.5" Mid-Length Chrome-Lined 1:8" Twist Black
Criterion Barrels Inc
$313.49
Criterion Barrels CORE 223 Wylde Carbine AR-15 Barrel 11.5in
Criterion Barrels Inc
$313.49
LMT Defense Chrome Lined Mid-Length Twist Barrel 5.56x45mm/.22 Cal 16" Fits LMT Defense L7S1A, Black
LMT
$472.99
Daniel Defense AR-15 5.56 NATO Barrel 11.5in Government Contour 1:7 Twist Phosphate
Daniel Defense
$296.99
Geissele CHF 5.56 NATO 14.5in 1:7 1/2x28 Chrome-Lined Taper Profile Barrel
Geissele Automatics
$287.00
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
5.56 NATO, .223 Remington, and .223 Wylde: Chamber Differences Explained
A technical breakdown of the differences between 5.56 NATO, .223 Remington, and .223 Wylde chambers — what each accepts safely, and how to choose for your build.
5 min read
Guide
The AK Platform: Core Design, Strengths, and Builder Tradeoffs
A practical AK overview covering operating system basics, parts ecosystem realities, and where the AK platform shines compared to AR-pattern rifles.
8 min read
Guide
.308 Win vs. 6.5 Creedmoor for AR-10 Builds
A technical comparison of .308 Winchester and 6.5 Creedmoor for AR-10 platform builds — covering ballistics, recoil, parts availability, and which cartridge fits which use case.
5 min read