Daniel Defense 12.5″ Cold Hammer Forged Barrel, 5.56 NATO, 1:7 Twist, Government Profile, Carbine-Length, with Low Profile Gas Block

Product Description

The Daniel Defense 12.5″ Cold Hammer Forged Barrel with Low Profile Gas Block is a 5.56mm NATO, 1:7 twist, Government-profile barrel on a carbine-length gas system, configured for a free-float handguard that runs over the gas block.

Twelve and a half inches is the longest of Daniel Defense’s carbine-gas Government-profile short barrels, and it is the one that behaves most like a full-size carbine. The extra length over 10.3 and 11.5-inch barrels buys real muzzle velocity, which is where short 5.56 barrels hurt most, and it lowers gas port pressure enough that the rifle usually runs correctly on a standard buffer and spring without tuning.

The low profile gas block configuration means the block sits below the handguard line, so a continuous free-float M-LOK tube can run over it. You get an unbroken top rail for optics, a clean forend for lights and lasers, and the option of swapping to an adjustable gas block later if the gun goes suppressed.

Key Facts

• Brand: Daniel Defense
• Model: 12.5″ 5.56mm, Carbine, 1:7, GOV
• Manufacturer Part Number: 07-077-07208
• Caliber: 5.56mm NATO
• Barrel Length: 12.5″
• Twist Rate: 1:7
• Barrel Profile: Government
• Gas System: Carbine Length
• Manufacturing Process: Cold Hammer Forged
• Material: 4150 Chrome Moly Vanadium (CMV) steel
• Bore Finish: Chrome lined
• Exterior Finish: Mil-Spec Heavy Phosphate
• Muzzle Thread: 1/2×28 TPI
• Diameter at Gas Port: .750″
• Barrel Extension: A4
• Barrel Weight (bare barrel): 1.40 lbs
• Barrel Configuration: With low profile gas block

Where 12.5 inches fits between short and standard

Think of 12.5 inches as the length that gives up the least. Compared with 10.3 and 11.5-inch barrels you recover meaningful velocity and gas system margin; compared with 14.5 inches you save about two inches of overall length and a little weight out front. For a registered short-barrelled rifle intended as a do-everything carbine, 12.5 inches is frequently the right answer.

Gas system and suppressor considerations

A carbine-length gas system on a 12.5″ barrel is well-proportioned: shorter dwell than mid-length, but far more forgiving than the same system on a 10.3″ barrel. Suppressed, port pressure rises and most builds benefit from an adjustable gas block, which the low profile configuration leaves easy to fit. The .750-inch journal on this barrel is the standard AR-15 dimension and Daniel Defense states that its gas blocks follow military specifications for dimensions. On a firearm configured as a pistol, none of that applies. Unsure which you are building? Call 817-393-4000 before ordering.

Compare this with the rest of our Daniel Defense barrels, pair it with a free-float tube from our rails and handguards, and see our suppressors if you are building toward a suppressed host.

Ordering from Western Sport in Roanoke, TX

Western Sport sits in Roanoke, Texas and has held a licensed FFL and SOT since 2007. We are a Daniel Defense master dealer with a gunsmith on site, and short-barrel uppers are everyday work here. Call 817-393-4000 and we will spec the gas block, tube and handguard alongside the barrel.

Frequently Asked Questions

Q: Why pick a 12.5″ barrel over an 11.5″ one?

A: Velocity and gas system margin. The longer barrel recovers muzzle velocity that short 5.56 barrels give away, and the gas port sits further from the chamber, which lowers peak pressure and lengthens dwell. A 12.5″ carbine-gas gun usually runs correctly on standard parts.

Q: Does this barrel require a tax stamp?

A: Not to purchase. A barrel is a component, not a firearm, so it requires no FFL transfer and no stamp. Installed on a rifle-configured receiver, a 12.5″ barrel creates a short-barrelled rifle that must be registered with BATFE and transferred through an SOT dealer.

Q: What does the 12.5″ Government profile barrel weigh?

A: Daniel Defense lists 1.40 lbs for the 12.5″ Government profile barrel. That is the bare barrel figure; there is no published assembled weight for this length with a low profile gas block fitted, so we will not invent one. Call 817-393-4000 if you need an exact assembled number.

Q: Can I fit an adjustable gas block to this barrel?

A: Yes. The gas journal is the standard .750-inch AR-15 dimension, and because this is the low profile gas block configuration the journal area sits under the handguard with no front sight tower in the way. That makes an adjustable block a straightforward later change, which is worth planning for if the gun will run suppressed.

Q: Which gas tube does it take?

A: A carbine-length gas tube. This barrel is built on a carbine-length gas system, so a mid-length tube is too long to seat properly. Getting the tube length wrong is a common build error that stops the rifle cycling entirely, so double-check before ordering parts alongside the barrel.

Q: Is the muzzle thread suppressor-ready?

A: The muzzle is threaded 1/2×28 TPI, the standard 5.56 thread, which accepts the usual range of suppressor mounts, brakes and flash hiders. You will need a mount cut for 1/2×28 rather than the 5/8×24 used on many 300 Blackout and 7.62-pattern barrels.

Additional information