The Daniel Defense MK18 RIII SBR is a battle-proven short-barreled rifle engineered for close-quarters performance, reliability, and control. Chambered in 5.56 NATO / .223 Remington, it features a 10.3-inch cold hammer forged barrel—the same length trusted in CQB operations—delivering exceptional durability and consistent accuracy in a compact footprint.

This updated RIII variant incorporates Daniel Defense’s lighter RIS III M-LOK rail system, replacing the older RIS II to improve handling and modularity. A fully ambidextrous lower receiver and GRIP-N-RIP charging handle ensure seamless operation for both left- and right-handed shooters. Finished in a Black and Flat Dark Earth color combination, the MK18 RIII SBR balances rugged military styling with modern ergonomics. All NFA regulations apply.

Key Features

• Manufacturer: Daniel Defense

• Model: MK18 RIII (DD4 MK18 RIII)

• Type: NFA Short Barrel Rifle (SBR)

• Caliber: 5.56 NATO / .223 Remington

• Action: Semi-Auto

• Barrel Length: 10.3" Cold Hammer Forged

• Twist Rate: 1:7

• Finish: Black / Flat Dark Earth

• Handguard: RIS III M-LOK Rail

• Capacity: 32 + 1

• Number of Magazines: 1

• Threaded Barrel: Yes (1/2x28)

• Sights: None

• Safety: 2-Position Thumb Safety

• Stock: Collapsible

• Overall Length: 26.5" – 30"

• Weight: 5.7 lbs