Sig Sauer MCX Rattler Canebrake .300 AAC Blackout Pistol, 5.5 in Barrel, Two-Tone Coyote Tan/Black
This Sig Sauer MCX Rattler Canebrake stands out with its compact 5.5-inch .300 BLK barrel, short-stroke gas piston system, and MCX buffer-tube-less design with a rear 1913 Picatinny interface. It features an extended SD-length free-float aluminum handguard with multiple M-LOK-style slots, a two-stage flat-blade Matchlite-type trigger, and a coyote tan/black two-tone Cerakote finish. Adjustable gas settings, ambidextrous controls, and a full-length top rail round out a purpose-built configuration.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Light markings from previous handling and use are present on exterior surfaces. Please review the photos for a detailed look at the finish and markings.
What's Included
- 1x 30-round Magpul PMAG GEN M3 polymer magazine for 300 BLK
- Rear flip-up iron sight (installed)
- SIG Sauer Inert Training Device (ITD) installed on the threaded barrel
The Canebrake configuration pairs a 5.5-inch .300 AAC Blackout barrel with an extended SD-length, free-float aluminum handguard that has multiple M-LOK-style slots and no forward top rail. A full-length 1913 Picatinny rail runs across the receiver for mounting sights and accessories.
Its short-stroke gas piston system includes adjustable settings for suppressed or unsuppressed use. The upper is a slick-side design without a forward assist, and the muzzle is threaded with a factory SIG Inert Training Device installed.
Controls are streamlined and modern: an ambidextrous safety and ambidextrous charging handle, with a right-side magazine release. The two-stage, flat-blade Matchlite-type trigger provides a defined pull, and the pistol uses a SIG-branded polymer grip.
The MCX architecture eliminates the buffer tube and uses a rear 1913 Picatinny interface. The aluminum receiver wears a coyote tan Cerakote (E190) within a two-tone coyote tan/black finish. Markings include "SIG SAUER INC NEWINGTON NH USA," "SIG MCX MULTI-CALIBER," and the "RATTLER" nameplate. Capacity is 30+1 with the included magazine, and the twist rate is 1:5. Made in the USA.