Daniel Defense DD4 RIIIS 5.56 NATO - 11.5" - AR-15 SBR - 1x32rd

The Daniel Defense DD4 RIIIS 11.5-inch SBR delivers Daniel Defense's cold hammer forged barrel, free-float RIS III rail, and mil-spec construction in the most compact configuration the DD4 platform offers — a short-barreled 5.56 NATO rifle built to the same quality standard as Daniel Defense's full-length lineup, sized for close-quarters use, vehicle operations, and duty applications where overall length is the primary constraint. NFA short-barreled rifle — Form 4 transfer required.

The Daniel Defense DD4 RIIIS is a complete semi-automatic 5.56 NATO SBR with an 11.5-inch cold hammer forged barrel, Daniel Defense RIS III free-float rail system, mil-spec bolt carrier group, and Daniel Defense furniture. Constructed from mil-spec aluminum and steel throughout with Daniel Defense's hard coat anodized black finish. NFA: SBR — Form 4 transfer required.

Daniel Defense's cold hammer forged barrel is the component that defines the DD4's accuracy and durability baseline — the CHF process aligns the steel grain structure along the bore axis under compressive force, producing a barrel that is inherently stronger and more wear-resistant at the throat and chamber than a button-rifled alternative of equivalent steel specification. The result is a barrel that maintains its accuracy potential through a higher round count than most comparable AR-15 barrels, which is the correct priority for a duty and hard-use SBR platform where sustained firing is part of the operational requirement. The RIS III free-float rail system removes the handguard from contact with the barrel, eliminating the accuracy-degrading contact pressure that standard carbine handguards impose on barrel harmonics — the rail mounts to the upper receiver via the barrel nut rather than the barrel itself, so accessories, lights, and lasers attached to the rail do not influence the barrel's harmonic vibration pattern. At 11.5 inches, the DD4 RIIIS achieves the handling characteristics that make AR-15 SBRs practical for vehicle work, building clearance, and close-quarters environments — compact enough to maneuver where a standard carbine cannot, while retaining the 5.56 NATO's terminal performance at the engagement distances where a pistol-format platform is realistically deployed. The SBR registration allows the 11.5-inch barrel without a permanent muzzle device, providing full flexibility in muzzle device selection for suppressor integration or other configurations. Daniel Defense builds every component to their published mil-spec and beyond-mil-spec standards, with quality control appropriate for a manufacturer whose products serve law enforcement and military users.

Caliber: 5.56 NATO. Barrel: 11.5-inch, cold hammer forged. Rail: RIS III free-float. BCG: mil-spec. Construction: mil-spec aluminum and steel. Finish: black hard coat anodized. NFA: SBR — Form 4 transfer required.

Cold hammer forged barrel maintains accuracy through higher round counts than button-rifled alternatives — the correct durability standard for a hard-use duty SBR. RIS III free-float rail eliminates barrel contact for consistent accuracy with accessories mounted. 11.5-inch SBR configuration provides the compactness for vehicle and CQB use while retaining 5.56 terminal performance at realistic engagement distances.

The right compact SBR for duty and hard-use users who want Daniel Defense's CHF barrel quality and RIS III free-float platform in an 11.5-inch 5.56 black configuration — Form 4 required.