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Ar-15 Modern Series Barrels 5.56mm - Ar-15 Modern Series 12.5 Carbine Barrel Gov'T
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$142.50
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SKU: 915000013
Overview
Built for AR-15 builders and upgraders who want a compact 12.5-inch carbine-length option, this barrel is chambered in 5.56 NATO and can also accept .223 Remington ammunition. Its government profile suits a practical, duty-style setup, while the M4 feed ramps and nickel-boron coated barrel extension are included to support reliable feeding and extraction. Ballistic Advantage positions this barrel within a broader Modern Series lineup that offers multiple chamberings, lengths, and contours for different rifle projects. It is a straightforward choice for a serious carbine build where compatibility and configuration matter.
Why Hunters Choose the Ballistic Advantage
Available 12.5-inch
Government contour for AR-15 builds
Chambered 5.56
NATO, accepting both 5.56x45mm and
Precision Machined
From 4150 chrome-moly-vanadium steel alloy
Nickel-boron Coated
Barrel extension includes M4 feed
Offered Multiple
Chamberings, lengths, and contours for
Key Features
- 12.5-inch carbine barrel in Government contour for AR-15 builds or upgrades.
- Chambered in 5.56 NATO; accepts both 5.56x45mm and .223 Remington ammunition.
- Precision machined from 4150 chrome-moly-vanadium steel alloy.
- Nickel-boron coated barrel extension included.
- M4 feed ramps designed to support reliable feeding and extraction.
- Part of Ballistic Advantage’s Modern Series barrel lineup.
Best Used For
- AR-15 builders wanting a 12.5-inch carbine barrel for a compact, versatile setup
- Shooters using 5.56 NATO or .223 Remington ammunition in an AR-15 build
- Users upgrading an existing rifle with a Government-profile barrel option
- Hunters or outdoorsmen building a shorter AR platform for general field use
Specifications
| Barrel Extension Coating | nickel-boron |
|---|---|
| Barrel Length | 12.5 |
| Chambering | 5.56 NATO |
| Compatible Ammunition | 5.56x45mm and .223 Remington |
| Country Of Origin | Ballistic Advantage |
| Feed Ramps | M4 feed ramps |
| Material | 4150 chrome-moly-vanadium steel alloy |
| Profile | Government |
| Series | Modern Series |
Pros
- Available in a 12.5-inch Government contour for AR-15 builds or upgrades.
- Chambered in 5.56 NATO, accepting both 5.56x45mm and .223 Remington ammunition.
- Precision machined from 4150 chrome-moly-vanadium steel alloy.
- Nickel-boron coated barrel extension includes M4 feed ramps.
- Offered in multiple chamberings, lengths, and contours for build flexibility.
Considerations & Trade-offs
- The 12.5-inch carbine-length format is a compact setup, so it may not suit shooters looking for a longer barrel profile or a different handling balance.
- This barrel is chambered in 5.56 NATO, which is compatible with 5.56x45mm and .223 Remington ammunition, but it is not a dedicated .223-only option.
- The Government contour is a specific profile choice, so buyers seeking a lighter or more specialized contour should verify it matches their build goals.
- The product description does not include some build details such as gas system, twist rate, or included accessories, so those points need to be confirmed before purchase.
Suggested Comparisons
- AR-15 barrels
- 5.56 NATO barrels
- Government profile barrels
- Carbine-length barrels
Suggested Accessories
- AR-15 upper receiver
- Muzzle device
- Handguard
- Barrel nut wrench
Frequently Asked Questions
What chambering is this barrel offered in?
This barrel is chambered in 5.56 NATO, and the description says it accepts both military-type 5.56x45mm and civilian .223 Remington ammunition.
What profile is listed for this barrel?
The product title identifies it as a Government contour barrel in the AR-15 Modern Series, with a 12.5-inch carbine barrel designation.
What material is the barrel made from?
The long description states that Ballistic Advantage precision machines these barrels from 4150 chrome-moly-vanadium steel alloy.
Does this barrel include features intended to support feeding?
Yes. The description says it has a nickel-boron coated barrel extension with M4 feed ramps to help ensure reliable feeding and extraction.
Is this barrel intended for a specific rifle platform?
Yes. It is an AR-15 barrel from Ballistic Advantage's Modern Series, so it is intended for AR-15 builds or upgrades.