This Rifle under NFA law is classified as a short barrel rifle (SBR) and requires a federal tax stamp. This entails a wait period as well. Please research and understand this process before purchase.

The Primary Weapons Systems MK107 SBR is a compact short-barreled rifle chambered in .300 Blackout, engineered for reliability, accuracy, and suppressor performance. At the heart of the rifle is PWS’s proven long-stroke piston operating system, featuring adjustable gas settings to optimize function while reducing fouling and gas blowback, particularly when shooting suppressed. The lightweight platform weighs just 5.2 pounds unloaded and features a 7.75-inch 416 stainless steel barrel with a 1:5 twist rate, delivering excellent performance with a wide range of .300 Blackout ammunition, including heavier subsonic loads. A PWS FRC 2-Port compensator comes installed, providing effective recoil control while remaining compatible with PWS PUB and Rearden Atlas suppressor mounting systems.

Built around precision-engineered 7075-T651 forged aluminum receivers with a durable OD Green Cerakote finish, the MK107 incorporates fully ambidextrous controls, a flared magazine well, and an integrated trigger guard for enhanced handling. The PicLok™ handguard combines Picatinny and M-LOK attachment interfaces to maximize accessory compatibility while maintaining a streamlined profile. Additional features include a Radian Raptor ambidextrous charging handle, a PTFE-coated enhanced mil-spec trigger with a 5.5 to 6.5-pound pull weight, and the Q LLC Shorty Stock system for an exceptionally compact footprint. Backed by the PWS VOW warranty, the MK107 SBR is a purpose-built platform that blends modern ergonomics, suppressor optimization, and lightweight maneuverability into a compact rifle configuration.