The Daniel Defense MK18 Black SBR is a short, maneuverable rifle platform built for professionals and serious shooters. This 5.56x45mm NATO configuration combines proven design with Daniel Defense’s reputation for precision manufacturing. Every Daniel Defense firearm is hand assembled, quality assurance tested, and test fired before shipment.
At the heart of this rifle sits a 10.3-inch cold hammer forged barrel. It delivers the close-quarters profile shooters demand while maintaining chrome-lined accuracy. The RIS II free-float quad rail system provides 360 degrees of accessory mounting.
Precision Engineering You Can Trust
Forged 7075-T6 upper and lower receivers meet or exceed Mil-Spec tolerances. Furthermore, this design ensures long-term durability under demanding conditions. The RIS II handguard lets you attach lights, lasers, and grips wherever you need them. Additionally, the cold hammer forged barrel delivers both reliability and consistent shot placement.
Materials & Construction
Lower Receiver: Daniel Defense Lower Receiver, Forged 7075-T6 Aluminum, Type III Hard Coat Anodized, Mil-Spec
Upper Receiver: Daniel Defense Upper Receiver, Forged 7075-T6 Aluminum, Type III Hard Coat Anodized, Forward Assist and Dust Cover
Handguard: Daniel Defense RIS II (Rail Interface System II), Free-Float Quad Rail, Continuous 1913 Picatinny Rail on All Four Sides, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized
Bolt Carrier Group: Daniel Defense Bolt Carrier Group, Mil-Spec MP Tested, HPT, with Properly Staked Gas Key
Charging Handle: Daniel Defense Mil-Spec Charging Handle
Trigger: Daniel Defense Mil-Spec Single-Stage Trigger
Buffer: Carbine H Buffer with Mil-Spec Action Spring
Receiver Extension: Daniel Defense Mil-Spec Carbine Receiver Extension, 6-Position
Buttstock: Daniel Defense MFT Battlelink Minimalist Stock, 6-Position Adjustable
Pistol Grip: Daniel Defense Pistol Grip, Glass-Filled Polymer with Soft-Touch Overmolding
Carbine-Length Direct Impingement Gas System with Low-Profile Gas Block
Trigger
Daniel Defense Mil-Spec Single-Stage Trigger
Mounting System
Picatinny (Quad Rail)
Handguard / Rail System
Daniel Defense RIS II (Rail Interface System II), Free-Float Quad Rail, Continuous 1913 Picatinny Rail on All Four Sides, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized
Bolt Carrier Group
Daniel Defense Bolt Carrier Group, Mil-Spec MP Tested, HPT, with Properly Staked Gas Key
Charging Handle
Daniel Defense Mil-Spec Charging Handle
Muzzle Device
Daniel Defense Mil-Spec Flash Suppressor, A2 Style, 1/2×28 Threaded
Buttstock
Daniel Defense MFT Battlelink Minimalist Stock, 6-Position Adjustable
Magazine
Magpul PMAG 32 GEN M3 (32-Round)
This rifle is configured with a barrel under 16 inches and a fixed shoulder stock, which makes it a Short-Barreled Rifle (SBR) under the National Firearms Act (NFA) — a Title II firearm. As of January 1, 2026, the federal making/transfer tax on SBRs was reduced to $0 under the One Big Beautiful Bill Act — but the item remains fully regulated. Before taking possession, the buyer (or their trust/entity) must still have an approved ATF Form 1 (if building/registering) or Form 4 (if transferring an already-registered SBR) on file, along with fingerprints, photos, and a completed NFA background check (no tax payment is due). Current eForm approval times are running roughly 10 days for individuals and about 26 days for trusts (as of spring 2026), though times vary. The rifle must be transferred through Western Sport’s SOT/Class 3 process to a licensed dealer in the buyer’s state, and some states restrict or prohibit SBR ownership outright. Western Sport cannot advise on individual compliance — buyers are responsible for following all applicable federal, state, and local law.
Why Buy from Western Sport?
Western Sport’s staff offers expert guidance on Daniel Defense rifles and accessories.
We provide competitive pricing and transparent communication about all available options.
Local pickup and fast shipping options get your rifle to you quickly.
Our after-sale support helps you maintain, upgrade, and master your rifle.
We’re a trusted Daniel Defense retailer with deep product knowledge and customer commitment.
Frequently Asked Questions
Q: What ammunition works best with the Daniel Defense MK18 Black SBR?
A: This rifle fires both 5.56x45mm NATO and .223 Remington ammunition. NATO loads deliver slightly higher velocity from the 10.3-inch barrel. Both cartridges perform reliably in this platform.
Q: What optics and lights are compatible with the RIS II rail system?
A: The RIS II quad rail accepts all standard Picatinny-mount accessories. Red dots, magnified optics, tactical lights, and vertical grips all mount securely. Additionally, sling attachments and laser modules integrate seamlessly with the system.
Q: How does the MK18 Black SBR compare to the MK18 FDE SBR?
A: Both rifles feature identical 10.3-inch barrels, RIS II rails, and Mil-Spec receivers. The FDE variant comes in flat dark earth finish instead of black. Choose based on your aesthetic preference and operational environment.
Q: What comes in the box, and does Western Sport offer a warranty?
A: Your rifle ships with essential documentation and is test-fired before delivery. Daniel Defense stands behind every rifle with a manufacturer’s warranty. Contact Western Sport for specific warranty details and available accessories.
Q: Do I need to file ATF paperwork or pay a tax stamp for this rifle?
A: Yes. This rifle’s barrel is under 16 inches with a shoulder stock attached, which makes it a Short-Barreled Rifle (SBR) under the NFA. As of January 1, 2026, the federal making/transfer tax on SBRs dropped to $0, so you’ll need an approved ATF Form 1 or Form 4 and a completed background check before taking possession, but no tax payment is due. The rifle must transfer through a licensed Class 3/SOT dealer.
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