Daniel Defense MK18 RIII Upper Receiver Group 5.56mm 10.3" FDE – Complete Drop-In Upper

The Daniel Defense MK18 RIII Upper Receiver Group delivers a complete, factory-assembled 5.56mm upper in Flat Dark Earth Cerakote. Built around a cold hammer-forged 10.3-inch government profile barrel with a 1:7 twist rate, this upper is designed for close-quarters performance with reliable terminal ballistics at short to mid-range distances. The RIS III handguard provides M-LOK slots at 3, 6, and 9 o'clock positions, with a continuous 12 o'clock Picatinny rail for optics and accessories.

This upper receiver group ships complete with a Daniel Defense bolt carrier group, flash suppressor, and charging handle. It is compatible with standard mil-spec AR-15 lower receivers. The carbine-length gas system and chrome-lined barrel are built to withstand sustained use. No lower receiver, sights, or optic included—upper only.

• Type: Complete Upper Receiver Group
• Caliber: 5.56x45mm NATO
• Barrel Length: 10.3 inches
• Barrel Profile: Government, cold hammer-forged, chrome-lined
• Twist Rate: 1:7
• Gas System: Carbine-length
• Handguard: RIS III with M-LOK, 9.55" length
• Finish: Flat Dark Earth Cerakote
• Includes: Bolt carrier group, charging handle, flash suppressor
• Compatibility: Mil-spec AR-15 lower receivers
• Use: Close-quarters applications; NFA registration required for barrels under 16" when installed on a rifle lower