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The MK12 Special Purpose Rifle earned its reputation the hard way, stretching 5.56 well past distances most people thought the cartridge could handle. The Daniel Defense DD4 SPRIII picks up right where that legend left off. At its heart is an 18-inch cold hammer forged stainless steel barrel cut to the classic MK12 profile, wearing a DLC finish and a 1:7 twist that stabilizes heavier match bullets. Pair that with a rifle-length gas system and MK12 gas block and you get the smooth, soft-cycling recoil impulse that made the original such a pleasure to shoot for long strings.
This is not just a throwback build. Daniel Defense wrapped the barrel in a 15-inch RIS III handguard with M-LOK slots and a full-length ARCALOCK bottom panel, so bipods, tripod plates, and barricade stops clamp on directly without stacking adapters. The lower receiver is fully ambidextrous, meaning you can run the safety, mag release, and bolt controls from either side without breaking your firing grip. Out back, a Magpul PRS Lite stock gives you adjustable length of pull and comb height for a proper cheek weld behind magnified glass, and the Geissele Super Semi-Automatic two-stage trigger delivers the clean, predictable break that precision work demands.
This rifle is built for people who want to reach out. Whether that means ringing steel at 600 yards, working positional stages in a precision gas gun match, or simply owning a 5.56 that shoots as well as you can hold, the SPRIII has the barrel, trigger, and furniture to do it right out of the box. It ships with a 32-round magazine and arrives without sights, so plan on topping it with a quality LPVO or mid-power scope to get the most from that barrel. If you have been waiting for a factory rifle that captures the MK12 magic with modern upgrades, this is the one Daniel Defense built for you.
The SPRIII keeps the core recipe that made the MK12 famous, an 18-inch stainless MK12-profile barrel and a rifle-length gas system, then updates everything around it. You get a 15-inch RIS III handguard with M-LOK and a full-length ARCALOCK panel, a fully ambidextrous lower, a Geissele SSA trigger, and a Magpul PRS Lite stock. Think of it as the MK12 concept built with two more decades of refinement.
No, it ships without sights and is set up as an optics-ready platform. Given the 18-inch barrel and precision focus, most owners pair it with an LPVO or a mid-power precision scope. The flat-top upper and long RIS III rail give you plenty of real estate for mounting.
The full-length ARCALOCK panel on the bottom of the handguard lets you clamp on ARCA-pattern bipods, tripod plates, and barricade accessories directly, no adapters needed. It also works with standard M-LOK gear, so you are covered either way. For anyone shooting off tripods or props, it is a genuinely useful feature rather than a gimmick.
The cold hammer forged stainless barrel runs a 1:7 twist, which stabilizes heavier match loads like 69 to 77 grain bullets. Those heavier projectiles are where this rifle really shines at distance, just like the original MK12 running Mk 262-style ammunition. It handles standard 55 grain range ammo fine too, but feed it match loads when accuracy counts.
| UPC | 818773024907 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 02-191-16291-047 |
| Action | |
| ATF Type | RIFLE |
| Barrel Length | 18" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 32 + 1 |
| Color | Black |
| Length | 42.5000 |
| Magazine Included | 1 x 32-Round |
| Model | |
| Number of Magazines | 1 32 rd. |
| Package Height | 4.0 |
| Package Width | 11.0 |
| Product Type | Rifle |
| Shipping Weight | 14.8 |
| Sights | No Sights |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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