Primary Weapons Systems MK107 MOD 2 in .300 Blackout delivers compact firepower with a 7.75″ barrel. Purpose-built for tactical and recreational shooting enthusiasts.
Update, October 9, 2026: ATF no longer requires a Form 4, tax stamp, fingerprints or registration for suppressors, short-barreled rifles, short-barreled shotguns or AOWs. They now transfer on a standard Form 4473 with a background check. Anything below that mentions a Form 4, a wait or a tax stamp was written before this change. What changed
The Primary Weapons Systems MK107 MOD 2 is a semi-automatic short-barreled rifle chambered in .300 Blackout with a 7.75″ barrel. This compact platform delivers the ballistic capability and maneuverability serious shooters demand for sporting and recreational use. Built on proven PWS design principles, the MK107 combines precision engineering with practical ergonomics.
Additionally, the rifle ships with a 30-round magazine and professional-grade components throughout. The FRC Compensator manages recoil while the PICLOCK free float handguard ensures consistent accuracy. BCM Adjustable Stock and BCM Grip provide customizable fit for shooters of all sizes.
Why the .300 Blackout Caliber?
The .300 Blackout round excels in compact rifles where velocity matters less than efficiency. Moreover, it delivers controlled power in a platform designed around intermediate distances. Consequently, the MK107 MOD 2 makes an excellent choice for precision target shooting and practical rifle applications.
Compact Barrel Design for Shooters
The 7.75″ barrel profile balances firepower with portability without sacrificing the reliability PWS is known for. This length suits sporting shooters who prioritize maneuverability and rapid target transitions. Therefore, the MK107 MOD 2 handles well in variable shooting scenarios.
Furthermore, the Cerakote finish in Olive Drab Green resists corrosion and wear through extended use. The entire rifle is engineered to standard semi-automatic operation, making it straightforward for lawful recreational shooters. In addition, the 30-round capacity provides sufficient ammunition for extended shooting sessions at the range.
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.
Frequently Asked Questions
Q: Is the Primary Weapons Systems MK107 MOD 2 legal to own in Texas?
A: Yes. The MK107 MOD 2 is a federally registered short-barreled rifle manufactured and sold through licensed FFL dealers. Texas law permits lawful ownership of registered NFA firearms. Western Sport handles all FFL transfer requirements and compliance documentation.
Q: What is the best use case for this .300 Blackout short-barreled rifle?
A: The MK107 MOD 2 excels for tactical shooting competitions, precision target practice, and recreational rifle shooting where compact size and maneuverability matter. The .300 Blackout round performs well at intermediate distances with controlled recoil.
Q: How does the 30-round magazine capacity serve shooters?
A: The 30-round capacity allows extended shooting sessions without frequent reloads, making it ideal for range days, training drills, and competitive shooting events. It provides practical capacity for both recreational and serious marksmanship training.
Q: What is included with my purchase from Western Sport?
A: Your MK107 MOD 2 comes with one 30-round magazine and is covered by Primary Weapons Systems’ manufacturer warranty. Western Sport provides FFL paperwork, compliance guidance, and ongoing support for your firearm.
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