Sig Sauer MCX .300 BLK 9in SBR .300 Blackout Black NFA Long Gun

Built on SIG Sauer’s MCX platform, this .300 Blackout SBR pairs a 9-inch barrel with the MCX semi-automatic operating system for compact, suppressor-friendly use. With a threaded barrel and an optic-ready rail system, it’s designed to integrate cleanly with modern accessories while remaining compliant through NFA requirements.

Key features

• .300 BLK configuration with a 9-inch SBR-length barrel
• Gas-operated semi-automatic MCX platform
• Threaded barrel (5/8x24) for standard .30 caliber muzzle devices
• Manual safety selector for straightforward operation
• Optic-ready rail layout for optics integration

For NFA buyers, this MCX SBR is a compact .300 BLK option engineered to run suppressed and support modern optics and accessories.