Daniel Defense DD4 MK18 RIII SBR 5.56 NATO 10.3in

The Daniel Defense DD4 MK18 RIII is an AR-style short-barreled rifle chambered in .223 Rem/5.56 NATO built around a 10.3-inch cold hammer-forged barrel. It employs Daniel Defense's RIS III free-float M-LOK rail system for accessory mounting while reducing weight compared to earlier RIS designs. Controls are fully ambidextrous and the rifle is finished in black with a collapsible Daniel Defense stock.

Key Specifications

• Chambered in .223 Rem/5.56 NATO.
• The barrel measures 10.3 inches and is cold hammer-forged.
• The action is Semi-Auto.
• Equipped with a Black RIS III M-LOK free-float rail.
• Controls are fully ambidextrous, including the charging handle and lower controls.
• The stock is a collapsible Daniel Defense stock.
• The muzzle is fitted with a flash hider.
• The barrel twist rate is 1-in-7.
• Overall length is listed as 26.5–30 inches.
• The listed weight is 5.73 lbs.

Built for compact handling and modular accessory mounting, the MK18 RIII balances maneuverability and durability. Its RIS III rail and ambidextrous controls provide flexibility for a wide range of configurations and use cases where a compact, ergonomic platform is required.