Daniel Defense DDM4 MK18 Pistol, 5.56 NATO, Mil-Spec+

Product Description

The Daniel Defense DDM4 MK18 Pistol in Mil-Spec+ is a semi-automatic 5.56 NATO pistol as configured by Daniel Defense, built on a 10.3" Government profile cold hammer forged barrel with a carbine-length gas system, the MK18 RIS II Picatinny quad rail, an SB Tactical SBA3 brace and a Daniel Defense flash suppressor. It weighs 5.85 lbs with an overall length of 28 5/8".

Daniel Defense is explicit about the category: this firearm is classified as a pistol and not a short-barrelled rifle, so no ATF approval or tax stamp is involved. It transfers through an FFL like any other pistol. We describe it exactly as Daniel Defense configures it — no legal advice about braces, no advice on changing anything.

The MK18 RIS II is what makes this the real thing: the Picatinny quad rail Daniel Defense currently provides to USSOCOM, built around a patented six-bolt Bolt-Up System and rigorously tested prior to fielding, free floating the barrel while giving continuous rail surface on four sides for night vision, lights and lasers. The 10.3" cold hammer forged barrel is the length commonly used for close-quarters work. The SBA3 brace offers five positions of adjustability and an integral ambidextrous QD point. Mil-Spec+ is the finish on this SKU.

Key Facts

• Brand / Model: Daniel Defense DDM4 MK18 Pistol
• Manufacturer Part Number: 02-088-21136 | UPC: 818773021821
• Finish: Mil-Spec+ | Legal category: Pistol, as configured by Daniel Defense
• Action: Semi-automatic | Caliber: 5.56mm NATO
• Barrel: 10.3", Government profile, 1:7 twist, cold hammer forged
• Barrel material / finish: Chrome Moly Vanadium steel; chrome lined, Mil-Spec heavy phosphate coated
• Gas system: Carbine length
• Muzzle device: Daniel Defense flash suppressor | Muzzle thread: 1/2 x 28 TPI
• Rail: Daniel Defense MK18 RIS II Picatinny quad, free floating, patented 6-bolt Bolt-Up System
• Brace: SB Tactical SBA3, 5 positions of adjustability, integral ambidextrous QD swivel point
• Grip: Daniel Defense pistol grip, soft touch overmolding, integral trigger guard
• Receivers: 7075-T6 aluminium, Type III hard coat anodized
• Bolt carrier group: M16 profile, MP tested, chrome lined, properly staked gas key
• Charging handle: Independently ambidextrous GRIP-N-RIP
• Magazine: DD Magazine (32 round)
• Weight: 5.85 lbs | Overall length: 28 5/8" with muzzle device
• Other: Flared magazine well, ambi safety selector, QD points

Pistol, not SBR — and why that matters to how you buy

Daniel Defense builds MK18-pattern firearms in both categories and they are bought completely differently. This one is a pistol: it transfers through an FFL, with no NFA paperwork and no tax stamp. The MK18 SBR is an NFA short-barrelled rifle requiring a BATFE tax stamp and an approved transfer through an SOT dealer — Western Sport is an SOT and can supply either. We will not advise on converting one into the other. Call 817-393-4000 and buy the right one first time. Compare our Daniel Defense pistols and MK18 range.

RIS II or M-LOK?

The RIS II quad rail is heavier than an M-LOK handguard, and that is the trade: continuous Picatinny surface on four sides, the SOCOM pedigree and M203 capability, at 5.85 lbs complete. The RIII-generation MK18 pistol uses an M-LOK RIS III rail if you would rather save weight. Browse red dot sights.

Ordering from Western Sport in Roanoke, TX

Western Sport is a Daniel Defense master dealer in Roanoke, Texas, a licensed FFL and SOT since 2007, with a gunsmith on site. This pistol is a serialized firearm and must be transferred through a licensed FFL — ours, or one closer to you. Call 817-393-4000 and we will handle the paperwork.

Frequently Asked Questions

Q: Is the DDM4 MK18 Pistol a short-barrelled rifle?

A: No. Daniel Defense is explicit that this firearm is classified as a pistol and not a short-barrelled rifle, so no ATF approval or tax stamp is involved. It transfers through an FFL like any other pistol. Daniel Defense builds the MK18 SBR as a separate, NFA-regulated product.

Q: What is the MK18 RIS II rail?

A: The Picatinny quad rail Daniel Defense currently provides to USSOCOM. It uses a patented six-bolt Bolt-Up System, was rigorously tested prior to fielding, and free floats the barrel while giving continuous rail surface on four sides for night vision, lights and lasers on a 10.3-inch host.

Q: How adjustable is the SBA3 brace?

A: Five positions, with an integral ambidextrous QD swivel attachment point. Daniel Defense fits it as part of this pistol’s configuration, and we describe the firearm only as the manufacturer configured it rather than advising on any change to it.

Q: How heavy is this pistol and how long?

A: 5.85 lbs, with an overall length of 28 5/8 inches including the muzzle device. The RIS II quad rail accounts for some of that weight compared with an M-LOK handguard, which is the trade for continuous Picatinny mounting surface and the SOCOM pedigree.

Q: What muzzle thread does the 10.3-inch barrel use?

A: 1/2 x 28 TPI, the standard 5.56 thread, fitted at the factory with a Daniel Defense flash suppressor. A short 5.56 barrel produces a large muzzle flash, so the suppressor does real work here. A sound suppressor would be a separate NFA purchase with its own transfer.

Q: Does this pistol still have to ship to an FFL?

A: Yes. It is a serialized firearm, so it transfers through a licensed FFL even though it is not an NFA item. Western Sport in Roanoke, Texas is an FFL and SOT and can complete the transfer in store or ship to a dealer near you. Call 817-393-4000.

Additional information