Daniel Defense MK18 RIII SBR 5.56 10.3″ FDE/Black

The Daniel Defense MK18 RIII is a short-barreled rifle built around proven AR-pattern ergonomics and modern accessory integration. It ships with a 10.3" cold hammer-forged barrel and the lighter RIS III rail system that accepts M-LOK attachments for modular setups. The platform features an ambidextrous lower and a collapsible Daniel Defense stock to support a variety of mission-focused configurations.

Key Specifications

• The cartridge is .223 REM/5.56 NATO.
• The barrel length measures 10.3 inches.
• The barrel is Cold Hammer Forged for consistent manufacturing standards.
• The action is Semi-Auto.
• The handguard is a RIS III M-LOK Rail for accessory mounting.
• The gas system is a Mid-Length Gas System.
• The stock is a Daniel Defense collapsible stock.
• The weight is listed as 5.73 lbs.
• The muzzle device is a Flash Suppressor.
• The twist rate is 1-in-7.

Compact and purpose-built, the MK18 RIII provides modern furniture and a short, rigid platform suitable for users who need a maneuverable rifle with modular accessory options. Its combination of a cold hammer-forged barrel, RIS III M-LOK handguard, and ambidextrous controls make it appropriate for applications where compact handling and consistent mechanical performance are priorities.