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When you're piecing together a compact AR-15 upper, the barrel is where you shouldn't cut corners, and Daniel Defense knows that better than most. This 12.5-inch Government contour barrel is cold hammer forged from 4150 Chrome Moly Vanadium steel, then finished with a Mil-Spec heavy phosphate coating on the outside and a chrome lined bore and chamber on the inside. That combination is what gives these barrels their reputation for lasting well past the point where a lot of other barrels would be worn out.
Cold hammer forging isn't just marketing talk here. The bore, chamber, lands, and grooves are all formed under intense pressure around a mandrel, which creates a defect-free bore and a consistent chamber from one barrel to the next. It's the same manufacturing process Daniel Defense uses on their military work, and it's a big part of why folks trust these for serious builds. You also get M4 feed ramps machined into the extension for reliable feeding when things get running fast.
The 1:7 twist rate is the sweet spot for 5.56, stabilizing everything from lightweight 55-grain M193 up through heavier 77-grain match loads without complaint. The carbine-length gas system keeps timing predictable in a short package, and the 1/2×28 muzzle threads accept just about any flash hider, comp, or brake you'd want to run. The Government profile gives you a traditional contour that balances weight and heat resistance nicely.
This is a stripped barrel, so it's aimed at builders who already have a gas block, gas tube, and the rest of their parts sorted out. At 12.5 inches it lands right in that Mk18-adjacent length that's popular for handy, maneuverable rifles and pistol builds, and it pairs well with a range of handguards. If you want a foundation that shoots straight and keeps doing it for the long haul, this is a strong place to start.
No, this is a stripped barrel, so it does not include a gas block, gas tube, or barrel nut. You'll need to supply those parts to complete your build. It's set up for a carbine-length gas system, so plan your components around that length.
The 1:7 twist handles a wide range of 5.56 and .223 loads, from lightweight 55-grain plinking ammo up to heavier 77-grain match and defensive rounds. That versatility is a big reason 1:7 is the go-to twist for most modern AR builds. You won't be locked into any single bullet weight.
Cold hammer forging shapes the bore, chamber, and rifling under heavy pressure around a mandrel, which creates a very consistent, defect-free bore. This process is a big reason Daniel Defense barrels tend to outlast button or cut rifled barrels. Combined with the chrome lining, it adds up to a barrel built for a long service life.
The 12.5-inch length sits right in that short, maneuverable range that clone and Mk18-adjacent builders gravitate toward. It uses the Government profile and M4 feed ramps that fit right into that style of upper. Pair it with a compatible handguard and the rest of your parts and you're on your way.
| UPC | 852548002349 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 07-077-17022-018 |
| Barrel Length | 12.5" |
| Color | Black |
| Length | 12.5'' |
| Model | |
| Product Type | Barrel |
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