Daniel Defense Mk18 SOCOM, 5.56mm, 10.3" Barrel, No Muzzle Device, Upper Receiver Group

​​​​​The Daniel Defense Mk18 SOCOM Complete Upper Receiver Group stands as the gold standard for close-quarters battle (CQB) performance, directly replicating the iconic platform supplied to USSOCOM. Chambered in 5.56mm NATO with a compact 10.3-inch cold hammer forged government profile barrel, it delivers exceptional accuracy, reliability, and velocity in short-barreled configurations. The 1:7 twist rate stabilizes a wide range of bullet weights, while the chrome-lined, Mil-Spec heavy phosphate-coated barrel undergoes high-pressure and magnetic particle inspection for unmatched durability under sustained fire. Paired with a carbine-length direct impingement gas system and pinned low-profile gas block, this upper ensures smooth cycling even in suppressed setups.

The standout feature is the Daniel Defense RIS II Mk18 handguard in Flat Dark Earth (FDE), a battle-proven, two-piece free-floating quad rail system CNC machined from 6061-T6 aluminum with Mil-Spec Type III hard coat anodizing. Its 6-bolt bolt-up attachment provides rock-solid stability, an uninterrupted top Picatinny rail for optics, and full-length side rails for accessories, while allowing easy integration of M203 grenade launchers when configured. The black Mil-Spec upper receiver, forged from 7075-T6 aluminum with M4 feed ramps and indexing marks, contrasts sharply with the FDE handguard for a tactical two-tone aesthetic that appeals to custom builders. Included are a chrome-lined M16-profile Daniel Defense bolt carrier group (properly staked gas key) and an ambidextrous GRIP-N-RIP charging handle for seamless operation from either side.

This complete upper group combines lightweight agility (around 3.5-4 lbs) with premium components engineered for hard use, making it ideal for law enforcement, military clones, home defense, or competitive short-barreled rifle builds. Backed by Daniel Defense's legendary lifetime warranty against defects, it offers unmatched quality and performance trusted by elite operators worldwide.

Build or upgrade your AR-15 with legendary SOCOM-grade reliability—shop the Daniel Defense Mk18 SOCOM Complete Upper Receiver Group at Battlehawk Armory today!

Specifications:

• Platform: Mk18 SOCOM
• Caliber: 5.56mm
• Barrel Length: 10.3"
• Twist: 1:7"
• Barrel Profile: Government
• Handguard: RIS II Mk18 FDE
• Daniel Defense Bolt Carrier Group
• Daniel Defense Charging Handle