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The MK12 name goes back to the designated marksman rifles that filled the gap between a standard carbine and a full-blown precision gun, and Daniel Defense's version stays faithful to what made the original special. At the heart of it sits an 18-inch cold hammer forged stainless steel barrel with the chamber forged right into the barrel rather than cut afterward, which keeps the chamber and bore in tight alignment for consistent accuracy. Add the DLC finish and you've got a barrel that resists corrosion and holds up round after round. The 1:7 twist handles everything from lighter varmint loads to heavier match bullets, so you've got flexibility depending on what you're feeding it.
The rifle-length direct impingement gas system is the quiet hero here. Longer dwell time means smoother cycling, softer recoil impulse, and reduced bolt carrier velocity, all of which translate to better shot-to-shot consistency when you're trying to hold a tight group. The MK12 low profile gas block is CNC machined from 416 hardened steel with a black oxide coating and built to Crane specifications for USSOCOM, the same spec that gave the original its reputation.
Up front you get the free-floating DDM4 12.0 quad rail. It never touches the barrel, so you can hang optics, a bipod, lights, or a sling without messing with your accuracy. The forged 7075-T6 upper is Type III hard coat anodized with M4 feed ramps and indexing marks, and it comes standard with an M16 profile bolt carrier group that's chrome lined with a properly staked gas key. The Daniel Defense flash suppressor caps it off in 17-4 stainless with a nitride finish.
This one comes with no sights, which is exactly what you want on a precision-minded build. Bolt on the glass and mount setup that fits your shooting and you're good to go. It's a natural fit for prairie dog towns, precision rifle work, 3-gun, or anyone who wants one 5.56 that can reach out past where a carbine runs out of steam.
This is a complete upper receiver group, so it ships with the barrel, DDM4 quad rail, M16 profile bolt carrier group, GRIP-N-RIP charging handle, and flash suppressor already installed. You just drop it onto any mil-spec AR15 lower and you're running. It does come with no sights, so you'll want to add your own optic or iron sights to your taste.
The MK12 was born as a designated marksman platform that bridges the gap between a carbine and a dedicated precision rifle. The 18-inch barrel and rifle-length gas system give it real reach out to the mid ranges while staying light enough to carry all day. It's a favorite for prairie dog and varmint work, precision rifle series, and 3-gun, and it makes a great pick for anyone who wants one 5.56 that can stretch its legs.
Daniel Defense forges the chamber into the barrel during the cold hammer forging process instead of cutting it afterward. This keeps the chamber and bore in the tightest possible alignment, which pays off in consistent accuracy. Pair that with the DLC finish and you get a barrel that shoots well and shrugs off corrosion over a long service life.
Yes, this upper is built on a forged 7075-T6 receiver with standard mil-spec dimensions, M4 feed ramps, and indexing marks. It mates up with any standard mil-spec AR15 lower receiver. Just make sure your lower's fire control group and buffer setup are squared away and you're ready to shoot.
| UPC | 815604016735 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 23-142-10035 |
| Barrel Length | 18" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Length | 28.6 |
| Package Height | 4.2 |
| Package Width | 5.6 |
| Product Type | Accessory-Uppers |
| Shipping Weight | 6.2 |
| Sights | No Sights |
| Style | Complete |
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