Sig Sauer MCX Rattler LT SBR | 5.56 NATO | RMCX-556N-7B-LT-SBR

The Sig Sauer MCX Rattler LT SBR is a compact, purpose-built short-barreled rifle in the MCX platform that emphasizes modularity and ambidextrous operation. Controls are fully ambidextrous and the operating system uses a short-stroke piston with an adjustable gas system for suppressed or unsuppressed use. The rifle ships with an M-LOK aluminum handguard, a SIG QD/suppressor-ready flash hider, and a flat-blade match-style trigger for consistent pull. Consider pairing this rifle with a low-power variable optic such as a 1–6×24 (for example, the Vortex Viper PST 1-6×24) for a versatile close-range sighting solution priced under $1000.

Typical applications include short-range precision and dedicated range training where compact handling and modular accessories matter, plus applications that benefit from a lightweight, easily-stowed rifle for professional or recreational field use.

Product Specifications

• The manufacturer part number is RMCX-556N-7B-LT-SBR.
• The manufacturer is Sig Sauer.
• The model designation is MCX Rattler LT SBR.
• The cartridge is listed as .223 Rem / 5.56 NATO.
• The action type is Semi-Auto.
• The barrel is described as threaded.
• The barrel material is stated as cold hammer forged carbon steel.
• The trigger type is a flat-blade match trigger.
• The operating system is a short-stroke piston.
• The handguard is a M-LOK aluminum handguard.
• The stock is a folding PDW (Minimalist Plus) design.
• The rifle includes 1 x 30-round removable magazine.
• The stated capacity is 30+1.
• Sighting is listed as optic ready.
• The UPC is 798681684632.

This MCX Rattler LT SBR delivers a concentrated feature set—ambidextrous controls, piston operation and modular compatibility with MCX components—packaged for minimal footprint and repeatable handling. If you need a compact, configurable platform that accepts accessories and barrels from the MCX family, this model is built to integrate with that ecosystem and perform in demanding short-range environments.

Related Videos: