SIG Sauer MCX Rattler Canebrake .300 BLK Pistol – 5.5" Barrel, Coyote Cerakote, Side-Folding Brace
The SIG Sauer MCX Rattler Canebrake is purpose-built for suppressed, short-barreled performance in .300 AAC Blackout. A factory-installed faux suppressor maintains the correct gas pressure when shooting unsuppressed, while the 5.5-inch, cold-hammer-forged barrel and 1:5 twist stabilize heavy subsonic rounds. Finished in durable Coyote Cerakote and fitted with a side-folding brace, this compact AR pistol offers fully ambidextrous controls and the proven MCX short-stroke gas piston system.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minor surface scratches and small handling marks are visible on the exterior finish; none affect function or performance.
What’s Included
- One 30-round Magpul PMAG polymer magazine marked "300 BLK / 7.62×35"
The heart of this Rattler Canebrake is SIG’s short-stroke gas piston with a two-position regulator. The system runs clean, stays cool under rapid fire, and is tuned for reliability with both subsonic and supersonic .300 BLK loads.
A 5/8-24 threaded, nitride-finished barrel pairs with the removable faux suppressor, giving you ready-to-go suppressor compatibility without changing the gas setting. The 1:5 rifling twist optimizes stability for heavy, subsonic bullets popular with .300 BLK shooters.
The SD-length free-float M-LOK handguard offers ample real estate for lights, lasers, and other accessories while covering most of the faux suppressor for a sleek, integrally-suppressed look. A full-length top rail and M-LOK slots at every cardinal position simplify mounting.
Controls are fully ambidextrous, including bolt catch, safety, and magazine release. A flat-blade, two-stage match trigger breaks at roughly 4.5 lbs, providing a crisp and predictable pull in a compact platform.
The lightweight 7075-T6 aluminum receiver set and aluminum-rubber side-folding brace keep overall length to a minimum for transport or storage. Combined with the Coyote Cerakote finish, this Rattler Canebrake is both rugged and distinctive.