Daniel Defense MK18 RIII 5.56 NATO SBR 10.3" Barrel - Black

Daniel Defense MK18 RIII 5.56 NATO SBR 10.3" Barrel - Black

The DD4 MK18 RIII AR15-style short-barreled rifle is unmatched in size, weight, and performance. It combines their tried-and-true MK18 with their Daniel Defense RIS III Rail Interface System. This revolutionary system takes the proven design of their two-piece RIS II rails-used by U.S. Special Operations Command (SOCOM) since 2006-and reduces weight while adding versatility by utilizing popular M-LOK attachment. So, you get the same proven free-float barrel design, durable aircraft-grade aluminum construction, and an uninterrupted upper rail platform with Mil-Spec 1913 rail of the RIS II-plus seven M-LOK attachment points along the handguard and integral QD swivel attachment points on both sides! The rest is all MK18, including a 10.3-inch Cold Hammer Forged barrel-the same length found in the MK18 upper most commonly used for CQB operations. An independently ambidextrous GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters, and the rifle comes with their ergonomic Daniel Defense Buttstock and Pistol Grip as well as three (3) low-profile rail ladders made from heat-resistant Santoprene to protect your support hand.

10.3" Cold Hammer‑Forged Barrel
Chrome‑lined, government‑profile barrel built for durability and CQB accuracy.

RIS III M‑LOK Handguard
Lightweight evolution of the SOCOM‑proven RIS II with seven M‑LOK slots and QD points.

Ambidextrous GRIP‑N‑RIP Charging Handle
Fully ambidextrous design for intuitive operation.

Mil‑Spec Receiver Set
7075‑T6 aluminum upper and lower with enhanced flared magwell and indexing marks.

Pinned Low‑Profile Gas Block
CNC‑machined 4140 steel block ensures long‑term reliability.

Powerful, Reliable BCG
M16‑profile, MP‑tested, chrome‑lined bolt carrier group with properly staked gas key.

Made in the USA
Built to the highest standards of quality and craftsmanship.

Specifications

• Caliber: 5.56 NATO / .223 Remington
• Barrel Length: 10.3"
• Barrel Profile: Government
• Barrel Material: Chrome Moly Vanadium steel
• Barrel Treatment: Cold Hammer Forged, chrome lined, heavy phosphate coated
• Twist Rate: 1:7
• Gas System: Carbine‑length direct impingement
• Gas Block: Pinned low‑profile 4140 hardened steel
• Muzzle Thread: 1/2×28 TPI
• Muzzle Device: Daniel Defense flash suppressor (17‑4 PH stainless steel, nitride finished)
• Upper Receiver: 7075‑T6 aluminum, Type III hard‑coat anodized
• Lower Receiver: 7075‑T6 aluminum, flared magwell, QD point, Type III hard‑coat anodized
• Handguard: 9.5" RIS III, 6061‑T6 aluminum, Type III hard‑coat anodized
• Bolt Carrier Group: M16 profile, MP tested, chrome lined, properly staked
• Charging Handle: GRIP‑N‑RIP ambidextrous
• Receiver Extension: 6‑position Mil‑Spec 7075‑T6 aluminum
• Buttstock: Daniel Defense polymer with soft‑touch overmolding
• Pistol Grip: Daniel Defense polymer with soft‑touch overmolding
• Rail Ladders: Three Santoprene ladders, heat‑resistant to 300°F
• Product Weight: 5.73 lbs
• Overall Length: 26 3/4" – 29 7/8" (with muzzle device)
• Magazine: 32‑round DD magazine