Product Description

Daniel Defense M4 URG MK18 Complete Upper – 10.3″ | Black

Experience elite-level performance and military-grade reliability with the Daniel Defense M4 URG MK18 Complete Upper Receiver Group in Black. Purpose-built to exceed professional standards, this 10.3” upper is the same battle-tested platform trusted by elite forces around the world — now available to civilians, law enforcement, and competitive shooters through Western Sport, your official Master Dealer for Daniel Defense.

This upper ships complete with a bolt carrier group (BCG), charging handle, Cold Hammer Forged 10.3” barrel, RIS II MK18 rail system, and low-profile gas block. Designed for seamless compatibility with any mil-spec lower receiver, this is the ultimate upgrade for your AR-15 platform.

⚙️ Key Features:

• Barrel: 10.3” Cold Hammer Forged, Chrome Moly Vanadium Steel, Chrome Lined, 1:7 twist for both subsonic and supersonic loads
• Upper Receiver: Mil-Spec 7075-T6 Aluminum, Type III hard coat anodized, with M4 feed ramps and indexing marks
• Handguard: Daniel Defense RIS II MK18 Rail System – durable, modular, and ideal for accessories and optics
• Gas System: Carbine length with pinned low-profile gas block (CNC machined from 4140 hardened steel)
• Flash Suppressor: Daniel Defense Flash Hider, 17-4 PH Stainless Steel, salt bath nitride finished
• Charging Handle: GRIP-N-RIP Ambidextrous Charging Handle – rugged, ergonomic, and suppressor-ready
• BCG: M16-profile, Mil-Spec MP tested, chrome lined with a properly staked gas key
• Color: All black finish – including the rail system
• Made in the USA – Backed by Daniel Defense’s renowned quality assurance and testing process

Built for Durability & Tactical Precision

The MK18 upper is built using Cold Hammer Forged barrel technology — a Daniel Defense signature. This manufacturing process creates an incredibly strong, precise, and defect-free bore that significantly extends barrel life while delivering superior accuracy. It’s the same process used in military-grade weapons systems for decades.

Whether you’re operating in high-stress tactical environments, training at the range, or customizing a top-tier home defense rifle, the MK18 Upper delivers uncompromising reliability and performance.

What’s Included:

• Complete Upper Receiver with 10.3” CHF Barrel
• Daniel Defense RIS II MK18 Rail (Black)
• GRIP-N-RIP Charging Handle
• Complete Bolt Carrier Group
• Pinned Low-Profile Gas Block

Sights and lower receiver sold separately.

NFA Notice:

IMPORTANT: When assembled into a complete firearm, this upper becomes a regulated item under the National Firearms Act (NFA). Please consult your local and state laws before assembling. The buyer is responsible for complying with all NFA regulations.

Why Buy from Western Sport?

As an authorized Daniel Defense Master Dealer, we provide direct access to the latest Daniel Defense upper receiver groups with expert support and fast, secure shipping. Each upper is hand-assembled, test-fired, and quality assurance checked to ensure the product you receive is field-ready and flawless.

We’re here to serve enthusiasts, professionals, and anyone who demands the best from their firearms platform. From the battlefield to the back 40, Daniel Defense delivers — and Western Sport is your trusted source.

Additional information