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Why buy from Western Sport?Western Sport is a Daniel Defense Master Dealer. All upper receiver groups are inspected and test-fired prior to shipment. Daniel Defense products carry manufacturer warranty—see Daniel Defense warranty details for full terms.
Original price was: $1,468.00.$1,366.00Current price is: $1,366.00.
15 in stock
Daniel Defense MK18 URG 10.3″ 5.56 Upper Receiver Group delivers unmatched military-grade performance in a compact platform. Featuring a Cold Hammer Forged barrel, RIS II MK18 rail, and GRIP-N-RIP charging handle, this complete upper is battle-proven, precision-built, and ready for any mission.
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Product Description
Daniel Defense MK18 URG 10.3″ 5.56 — Complete Upper Receiver (Black)
Premium Daniel Defense MK18 URG complete upper — 10.3″ Cold Hammer Forged barrel, RIS II MK18 rail, pinned low-profile gas block, M16-profile BCG, and GRIP-N-RIP charging handle. Test-fired, inspected, and backed by Daniel Defense quality.
Why the MK18 URG 10.3″ upper?
- Battle-proven platform: Military-derived MK18 URG geometry and Daniel Defense component set used by special operations units.
- Precision barrel: 10.3″ Cold Hammer Forged Chrome Moly Vanadium barrel (1:7) — chrome-lined, MPI/HP tested for longevity and consistent accuracy.
- Premium rail system: Daniel Defense RIS II MK18 handguard — rigid, lightweight, and optimized for mounting sights and accessories.
- Suppression-ready: Pinned low-profile gas block and GRIP-N-RIP charging handle make suppressed operation reliable and user-friendly.
- Factory-tested: Each upper is assembled, MP-tested, and test-fired for quality assurance by Daniel Defense and inspected by Western Sport.
Overview & video
Watch the MK18 URG in action — overview of features, handling, and mounting options.
Technical specifications
| Manufacturer | Daniel Defense |
|---|---|
| Product | MK18 URG Complete Upper Receiver Group (10.3″ / Black) |
| Caliber | 5.56×45mm NATO |
| Barrel | 10.3″ Cold Hammer Forged Chrome Moly Vanadium — 1:7 twist — Government profile — Chrome lined — MPI/HP tested |
| Upper Receiver | Mil-Spec with indexing marks & M4 feed ramps — CNC 7075-T6 Aluminum — Type III Hard Coat Anodized |
| Handguard | RIS II MK18 — CNC 6061-T6 Aluminum — Type III Hard Coat Anodized |
| Gas System | Pinned low-profile gas block — CNC 4140 hardened steel — Carbine length — Direct impingement |
| Muzzle Device | Daniel Defense Flash Suppressor — 17-4 PH stainless — Salt Bath Nitride finish |
| Bolt Carrier Group | M16 profile — Chrome-lined — MP tested — Properly staked gas key |
| Charging Handle | GRIP-N-RIP ambidextrous charging handle — CNC aluminum components |
| Weight (approx.) | 3.8 lb (varies by configuration) |
| Compatibility | Fits all MIL-SPEC AR-15 lower receivers; accepts standard AR sights and optics (sights sold separately) |
| Origin | Made in USA |
What’s included
- Complete MK18 URG upper receiver with 10.3″ CHF barrel
- Daniel Defense RIS II MK18 handguard (Black)
- M16-profile Mil-Spec Bolt Carrier Group (chrome-lined)
- GRIP-N-RIP ambidextrous charging handle
- Pinned low-profile gas block & Daniel Defense flash suppressor
Important legal note: Assembling this upper into a complete firearm may be regulated under the National Firearms Act (NFA). Buyers are responsible for compliance with all federal, state, and local laws. Review ATF NFA guidelines.
Frequently asked questions
- Is the MK18 URG 10.3 compatible with my AR-15 lower?
- Yes. This complete upper is designed to mate with standard MIL-SPEC AR-15 lowers that use a 5.56/.223 bolt and buffer assembly. Always verify lower compatibility and local laws before installation.
- Does the package include sights or a magazine?
- No — sights and magazines are sold separately. The RIS II handguard provides Picatinny/attachment points for optics, backup sights, and accessories.
- Can I use a suppressor with this upper?
- Yes — the pinned low-profile gas block and GRIP-N-RIP charging handle improve suppressed operation, but suppressed use may change cyclic behavior and should be tuned by a qualified gunsmith.
- Is the barrel chrome-lined?
- Yes. The 10.3″ Cold Hammer Forged barrel is chrome-lined and MPI/HP tested for durability and reliable service life.
MK18 URG advantages at a glance
- Purpose-built short-barrel length for CQB & fast handling without compromising barrel life thanks to Cold Hammer Forging and chrome lining.
- Factory-built rail and pinned gas system for robust accessory mounting and reliable gas timing.
- Proven component set (M16 BCG, GRIP-N-RIP) for straightforward maintenance and parts compatibility.
| Barrel Length | 10.3 |
|---|---|
| Caliber | 5.56 |
| Condition | New in Box |
| Finish Per Color | Black |
| Manufacturer Part Number | 23-004-08013-006 |
| Model | MK18 |
| Type | Uppers |
| UPC | 815604014045 |
1 review for Daniel Defense M4 URG MK18 Black
Additional information
| Features | MATERIALS & CONSTRUCTION Upper Receiver: A4 Upper Receiver with M4 Feed Ramps Barrel Characteristics: 10.3 Cold Hammer Forged, 5.56 NATO Chamber, 1:7 Twist, Govt Profile, Carbine Gas Port, Chrome Lined, Mil Spec Heavy Phosphate Coated, HP and MPI tested Bolt Carrier Group: F/A BCG, HP and MPI Tested, Shot Peened Bolt, Extractor Booster, Properly Staked Gas Key Flash Hider: A2 Bird Cage Flash Hider Rail System: RIS II MK18 Low Profile Gas Block Weight: 3lbs 8oz |
|---|
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Michael Pierson (verified owner) – :
DD mk18 is absolutely perfection. Balanced, compact, quality built. I ordered it from Western Sports and and had it within 5 days. Absolutely a pleasure doing business with them and an awesome upper