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Daniel Defense MK18 SBR 10.3 inch 5.56 NATO — Black
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Home » Shop » Daniel Defense MK18 SBR 10.3 inch 5.56 NATO — Black
Sale!
$2,499.00Original price was: $2,499.00.$2,324.00Current price is: $2,324.00.
🚚 Ships to your local FFL — order online, put your dealer’s address in shipping, and we coordinate the rest. Most firearms ship same or next business day. How buying a gun online works.
Daniel Defense MK18 SBR 5.56 NATO 10.3″ barrel, Black/Mil-Spec+ finish — the civilian USSOCOM MK18 Mod 1 SBR in standard Black. Cold hammer forged 10.3″ barrel, RIS II quad-rail, ambidextrous controls. NFA Form 4 SBR. $0 NFA stamp under OBBBA.
⚠ NFA ITEM — SHORT BARRELED RIFLE
This is a federally regulated Short Barreled Rifle (SBR) under the National Firearms Act. Purchase requires a BATFE Form 4 transfer, background check, and $200 NFA tax stamp — now $0 under the One Big Beautiful Bill Act (OBBBA). Buyer must be 21+, a US citizen, reside in an NFA-legal state, and have no disqualifying criminal history. Current ATF approval times vary — see our NFA wait times guide. First NFA purchase? Here is how the Form 4 works at Western Sport, and there is no filing fee when you buy the item from us. Western Sport handles all paperwork — call 817-393-4000.
The Daniel Defense MK18 SBR in Black is the standard-finish version of DD’s SOCOM-heritage 10.3-inch short barrel rifle — the same cold hammer forged barrel, RIS II quad-rail, and Mil-Spec+ engineering that US special operations units have depended on for over twenty years, now available as a civilian Form 4 NFA transfer with $0 stamp fee under the One Big Beautiful Bill Act.
The Black Mil-Spec+ finish is DD’s standard finish specification — the same corrosion-resistant cerakote-based coating applied to government contract rifles. If you’re coordinating gear in a black color scheme or want the traditional appearance of the military MK18 Mod 1, the Black variant is the choice.
Daniel Defense MK18 SBR — Black Specifications
Spec
Detail
Caliber
5.56 NATO / .223 Remington
Barrel
10.3″ cold hammer forged, carbine-length gas
Twist Rate
1:7 RH
Muzzle
1/2×28, flash suppressor
Rail
Daniel Defense RIS II 9.5″ (Picatinny quad-rail)
Stock
Daniel Defense MFR adjustable
Weight
6.02 lbs (unloaded)
Finish
Black / Mil-Spec+
NFA Class
SBR — Form 4, $0 stamp (OBBBA)
Made in USA
Black Creek, Georgia
Why 10.3″ Is the Sweet Spot for Close-Quarters 5.56
USSOCOM tested multiple barrel lengths in the 8–12 inch range before settling on 10.3 inches for the MK18 program. At 8–9 inches, 5.56 ammunition becomes seriously reliability-compromised with ball ammunition — the carbine-length gas system doesn’t have enough dwell time to reliably operate the bolt. At 14.5 inches, the M4 configuration is excellent for open environments but too long for VBSS, aircraft, or vehicle ops. The 10.3″ length hits the crossover point: reliable function with M855 and M193 ball ammunition, enough barrel to maintain useful terminal ballistics at close-to-medium range, and short enough to operate genuinely well in confined spaces. Twenty years of SOCOM use confirms the engineering decision. For the full breakdown — Mod 0 vs Mod 1 vs Mod 2, effective range, and running it suppressed — read our Daniel Defense MK18 specs and review.
Ordering from Western Sport
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
FAQ — DD MK18 SBR Black
MK18 Black vs. MK18 Brown — any mechanical difference?
No — mechanically identical. The difference is finish only. Black Mil-Spec+ for standard appearance; Brown Mil-Spec+ for DD’s earth-tone color scheme that coordinates with FDE/coyote accessories.
Does the DD MK18 use standard AR-15 magazines?
Yes — standard STANAG / AR-15 pattern 5.56 magazines. Ships without a magazine but accepts Magpul PMAG, aluminum GI mags, and any standard AR-15 5.56 magazine.
“MK18” describes a 10.3in configuration, not a single product, and Daniel Defense sells it in three legally different forms. This is the thing most buyers need sorted out before they can shop on price at all.
Form
What it is
Paperwork
Who it suits
MK18 SBR (this listing)
A complete rifle with a 10.3in barrel and a stock
NFA item. ATF Form 4 and a tax stamp
You want the real thing, shoulder-fired, and you are willing to wait for the stamp
MK18 Pistol
Same barrel, built as a pistol with a brace instead of a stock
No NFA paperwork. Transfers as an ordinary handgun
You want it now, without a stamp
MK18 URG (upper only)
Complete upper receiver group — no lower, no serial number
None. Ships to your door
You already own a lower to put it on
The trap to avoid: putting a 10.3in upper onto a lower that is currently configured as a rifle creates an unregistered short-barrelled rifle. That is a felony, not a technicality. If you are buying a URG to build on an existing lower, know which way that lower is configured first.
Frequently Asked Questions
Q: Can a civilian buy a Daniel Defense MK18?
A: Yes. There is nothing restricted about the MK18 as a design — it is a standard semi-automatic AR-15 with a 10.3in barrel. What determines the paperwork is the form you buy it in. As a pistol or as an upper receiver group there is no federal registration at all. As a short-barrelled rifle, like this listing, it is an NFA item and needs an approved Form 4 before you can take delivery — and since January 2026 the federal tax stamp on a short-barrelled rifle is $0.
Q: Can you legally own an MK18?
A: In most of the United States, yes. Short-barrelled rifles are federally legal with the correct NFA registration, but a number of states prohibit them regardless of federal approval, and a few restrict the whole platform. Your state law decides it.
Q: How long is the wait for the stamp?
A: Far shorter than it used to be. Recent eForm 4 approvals have been coming back in about two weeks or less, though that figure moves. See our NFA wait times guide for the current picture.
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