AR15 16" 5.56 Barrel 4140 MT
$176.99 at Ammunition Depot · 5 stores
In stock
CMMG Inc Barrel Sub-Assembly Multi Role Profile 5.56mm 12.5in 4140CM Salt Bath Nitride
No ratings yetBest price
$199.95at CMMG
checked Oct 22, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| CMMG Best price | $199.95checked Oct 22, 2026 | Check store | Buy at CMMG | |
| OpticsPlanet | $193.49Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $193.49 at OpticsPlanet. Dashed line = out of stock. Tracking since Oct 12, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| CMMG | $199.95 | $199.95 | $199.95 |
| OpticsPlanet | $193.49 | $193.49 | $193.49 |
Since Oct 12, 2026.
About this part
The CMMG Inc Barrel Sub-Assembly Multi Role Profile 5.56mm 12.5in 4140CM Salt Bath Nitride is a 12.5" 5.56 / .223 barrel from CMMG with a carbine gas system. It's sold by 2 stores, from $193.49 to $199.95. The lowest in-stock price in the last 30 days was $193.49 at OpticsPlanet.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Carbine · Handguards
- Muzzle thread
- 1/2x28 · Muzzle devices
- Barrel length
- 12.5" · Handguards
Specifications
- Manufacturer
- CMMG
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
- Gas system
- Carbine
- Barrel length
- 12.5"
- Twist rate
- 1:7
- Thread pattern
- ½ x 28
From the manufacturer
CMMG Inc Barrel Sub-Assembly Multi Role Profile 5.56mm 12.5in 4140CM Salt Bath Nitride. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. Features of CMMG Inc 5.56x45mm Nato Mk4 Barrel Sub Assembly - 12.5inch Mr 4140cm Sbn 5.56mm: 12.5" Multi Role Profile 4140 Chrome Moly Salt Bath Nitride Finish inside and out 1:7 Twist 5.56 45 NATO Chamber Threaded 1/2-28 Carbine length gas port .750" Gas Journal Package Contents: CMMG Inc 5.56x45mm Nato Mk4 Barrel Sub Assembly - 12.5inch Mr 4140cm Sbn 5.56mm Specifications for CMMG Inc 5.56x45mm NATO Barrel Sub-Assembly: Manufacturer: CMMG Caliber: 5.56x45mm NATO Barrel Twist Rate: 1-7 Flutes: No Gun Model: AR-15 Included Accessories: Standard Condition: New Gun Type: Rifle Firearms Threads Per Inch: 1/2x28 Package Contents: CMMG Inc 5.56x45mm NATO Barrel Sub-Assembly What firearm models does the manufacturer say CMMG Inc 5.56x45mm NATO Barrel Sub-Assembly is compatible with? The manufacturer suggests that CMMG Inc 5.56x45mm NATO Barrel Sub-Assembly is compatible with AR-15CMMG Inc 5.56x45mm Nato Mk4 Barrel Sub Assembly - 12.5inch Mr 4140cm Sbn 5.56mm - 55DDF0A
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