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MK18

MK18 CQBR Rifles and Upper Receiver Groups

At Western Sport, we specialize in the MK18 platform,
the definitive choice for close-quarters battle (CQB) reliability. Originally
developed for USSOCOM, the MK18 is defined by its 10.3-inch barrel and
battle-proven durability. Our curated selection focuses on
contract-grade hardware vetted for professional and
defensive applications.

Whether you are looking for a complete Daniel Defense MK18
or a stripped CQBR Upper Receiver Group to start a
clone build, our inventory features the specific components that define
this legendary system. We stock the iconic RIS II quad rail,
correct gas block configurations, and muzzle devices optimized for
suppressed fire.

From NFA-compliant Short Barreled Rifles (SBRs) to pistol configurations,
Western Sport provides the technical expertise to ensure your setup meets
the highest standards of SOPMOD performance. Browse our
lineup of 10.3″ systems today and experience the gold standard of
compact firepower.

  • Sale! Daniel Defense MK18 RIII URG

    Daniel Defense MK18 RIII URG

    Original price was: $1,468.00.Current price is: $1,366.00.
    Add to cart

  • Sale! Daniel Defense MK18 RIII URG Black

    Daniel Defense MK18 RIII URG Black

    Original price was: $1,468.00.Current price is: $1,366.00.
    Add to cart

  • Sale! Rankin Daniel Defense 300S Pistol

    Daniel Defense Rankin Industries 300s Pistol w/ Law Tactical Folder

    Original price was: $2,224.00.Current price is: $2,119.99.
    Add to cart

  • Sale! MK18 Black Law Folder Right

    Daniel Defense Rankin Industries MK18 Pistol Black with Law Tactical Folder

    Original price was: $2,224.00.Current price is: $2,119.99.
    Add to cart

  • Sale! MK18 Pistol FDE Law Right 1

    Daniel Defense Rankin Industries MK18 Pistol FDE Law

    Original price was: $2,224.00.Current price is: $2,119.99.
    Add to cart

  • Placeholder

    Daniel Defense Rankin Industries MK18 RIII Pistol

    $1,999.00
    Add to cart

  • Sale! V7S Left Law Folder

    Daniel Defense Rankin Industries V7S Pistol with Law Tactical Folder

    Original price was: $2,224.00.Current price is: $2,119.99.
    Add to cart

The MK18 Standard: Reliability in a Compact Profile

The MK18 is more than just a short-barreled AR-15; it is a
precisely engineered system designed to cycle reliably under suppressed
and unsuppressed conditions. At Western Sport, we ensure
our MK18 components meet the specific technical requirements of this
renowned platform.

1. Optimized Gas Porting: The 10.3-inch barrel requires
precise gas port sizing to ensure reliable cycling. Our MK18 uppers and
barrels are tuned to provide consistent extraction and ejection without
over-gassing the system.

2. Free-Float RIS II Rails: We carry the authentic
Daniel Defense RIS II, the rail system selected by SOCOM
for its extreme rigidity and ability to maintain zero for lasers and
optics under harsh field conditions.

3. Barrel Integrity: Our selection features Cold Hammer
Forged (CHF) barrels with a 1:7 twist rate, designed to stabilize heavy
duty rounds like 77gr OTM while providing a long service life.

4. Suppressor Compatibility: Given the MK18’s heritage,
we prioritize components that are “suppressor ready,” featuring the
correct threads and clearance for the industry’s leading fast-attach
muzzle devices.

Based in North Texas, Western Sport is your source for duty-grade
short-barrel systems. Whether you’re building a clone or a
modern defensive tool, our MK18 inventory delivers the uncompromising
performance you demand.