Product Overview
- Short-barreled rifle (SBR) chambered in .300 AAC Blackout with a 9-inch barrel.
- Short-stroke gas piston operating system on the MCX platform; folding stock and ambidextrous safety in Flat Dark Earth.
- 30+1 round capacity; aluminum receiver construction.
- Must ship to a Federal Firearms License (FFL) holder.
Overview
The SIG SAUER MCX SBR is a .300 AAC Blackout short-barreled rifle on the MCX platform. The 9-inch barrel features a 1:7 twist rate and is fed by a short-stroke gas piston operating system. The aluminum receiver is finished in Flat Dark Earth and the rifle is equipped with a folding stock and ambidextrous safety. Capacity is 30+1 rounds.
Key Features
- Caliber: .300 AAC Blackout — intermediate SBR cartridge compatible with suppressed and unsuppressed use.
- 9-inch barrel with 1:7 twist — longer than the Rattler variant, offering additional velocity.
- Short-stroke gas piston operation — keeps combustion fouling out of the receiver area.
- Folding stock in Flat Dark Earth — reduces overall length; color-matched to receiver.
- Ambidextrous safety selector — operable from either side of the receiver.
- Aluminum receiver in Flat Dark Earth finish — standard MCX construction.
- 30+1 round capacity — accepts standard MCX-pattern .300 Blackout magazines.
FFL & Compliance
This short-barreled rifle is an NFA-regulated item and must ship to a Federal Firearms License (FFL) holder. Buyers are responsible for understanding and complying with all applicable local, state, and federal laws, including NFA transfer requirements. Magnum Ballistics does not provide legal advice or determine individual eligibility. We ship only to the FFL dealer selected during checkout.
