SIG SAUER MCX RATTLER 5.56NATO 30RDS 5.5-INCHES

SIG SAUER MCX Rattler 5.56 NATO Pistol: Maximum Capability, Minimum Profile

The SIG SAUER MCX Rattler 5.56 NATO was engineered from the ground up to be as discrete as possible while preserving every robust capability the MCX platform is known for, delivering a full-power rifle cartridge in a package that goes where standard rifles simply cannot. 

Combining a 5.5-inch PDW barrel with a folding pistol stabilizing brace and free-floating M-LOK handguards, the Rattler is the definitive choice for fast-moving operators who refuse to compromise.

• Manufacturer Part: PMCX-5B-TAP
• UPC: 798681600199
• Type: AR Pistol, Semi-Automatic
• Caliber: 5.56 NATO
• Barrel Length: 5.5 inches
• Overall Length: 23 inches
• Weight: 5.1 lbs
• Capacity: 30 rounds
• Stock: Folding Pistol Stabilizing Brace
• Handguard: Free-floating M-LOK
• Grips: Black Polymer
• Sights: None, optics ready
• Metal Finish: Black
• Condition: New in Box

At just 5.1 pounds and 23 inches overall, the Rattler punches far above its size class, and the optics-ready configuration means you can run your preferred red dot or magnified optic right out of the box. This is a platform built for professionals who need performance without the footprint.

SIG SAUER MCX Rattler Handling and Deployment

The SIG SAUER MCX Rattler is built around the reality that operators need a weapon system that deploys instantly and handles confidently in confined spaces. The folding pistol stabilizing brace collapses the profile dramatically for storage and transport, then opens quickly to provide a stable shooting platform when the situation demands it. 

At 23 inches overall with the brace deployed, the Rattler remains dramatically more compact than any standard 5.56 NATO rifle while retaining the semi-automatic AR-type action and 30-round capacity that serious users depend on. The black polymer grip provides a firm, consistent hold in any condition.

SIG SAUER MCX Rattler Configuration and Versatility

The free-floating M-LOK handguard gives operators a clean, interference-free mounting surface for lights, lasers, grips, and any other accessories the mission calls for, all without affecting barrel performance. The PDW upper and 5.5-inch barrel are matched specifically to keep the overall package tight while still generating meaningful terminal performance with 5.56 NATO ammunition. 

With no factory sights installed, the optics-ready upper is a blank canvas for whatever aiming solution you prefer, from a lightweight red dot to a compact low-power variable optic. The all-black finish keeps the profile professional and corrosion-resistant across hard use in the field.

Why Operators Choose the MCX Rattler

The 5.56 NATO chambering sets this Rattler apart from the .300 Blackout variant, offering broader ammunition availability and familiar terminal ballistics for those already standardized on the cartridge. 

The combination of a full-power rifle round, a 30-round magazine, folding brace, M-LOK rail system, and sub-6-pound weight is an engineering achievement that very few platforms in any category can match. Condition is new in the box, so the Rattler arrives ready for immediate configuration and deployment. 

For any operator, competitor, or serious shooter who needs a compact, capable, and configurable 5.56 NATO platform that disappears when it has to and delivers when it counts, the MCX Rattler is the clear answer.