The Daniel Defense MK18 complete upper receiver group is built for the AR-15 platform with a compact 10.3in cold hammer forged 5.56mm NATO barrel and the DD RIS II MK18 quad rail for secure mounting and control in close-quarters use.

Key features

• DD RIS II MK18 quad rail with bolt-up style rigidity for reliable accessories
• Independently ambidextrous GRIP-N-RIP charging handle for left- and right-handed use
• Flat Dark Earth Cerakote handguard for distinctive looks and durable finish
• Optic-ready upper built to support modern sighting setups
• 10.3in cold hammer forged chrome moly steel 5.56mm NATO barrel with 1:7 twist
• Includes an M16 profile bolt carrier group as standard for complete upper receiver groups

If you’re looking for a compact, modern MK18-style upper for AR-15 builds, this Daniel Defense configuration delivers race-ready fitment and day-to-day durability.