SIG SAUER MCX Regulator Semi-Auto Rifle – 5.56 NATO, 16″ Barrel, SGA 590 Stock, ROMEO2 Red Dot, 10-Round

The SIG SAUER MCX Regulator is a modern sporting rifle that combines the proven performance of the MCX platform with the ergonomics of a traditional ranch-style rifle. Chambered in 5.56 NATO, it features a 16-inch cold hammer-forged barrel and SIG SAUER’s renowned short-stroke gas piston operating system, delivering exceptional reliability, reduced fouling, and consistent performance in a lightweight, versatile package.

Built around a redesigned lower receiver, the MCX Regulator accepts all MCX upper receivers, offering outstanding modularity for future caliber and configuration changes. The rifle is equipped with a Magpul SGA 590 stock, fully ambidextrous controls, an integrated ARCA rail for tripod compatibility, and a free-floating M-LOK® handguard for accessories.

This configuration comes factory-equipped with the SIG SAUER ROMEO2 red dot optic, providing fast target acquisition with a rugged enclosed configuration and multiple illumination settings. A 2-stage match trigger, SIG-designed compensating muzzle brake, and 10-round magazine complete this premium rifle, making it an excellent choice for recreational shooting, competition, hunting where legal, and other lawful sporting applications. (SigOptics)

Specifications

Key Features

• Chambered in 5.56 NATO
• 16-inch cold hammer-forged barrel
• Proven short-stroke gas piston operating system
• Factory-installed SIG SAUER ROMEO2 1x red dot optic
• Magpul SGA 590 traditional stock
• Fully ambidextrous magazine release, safety selector, and bolt catch
• 2-stage match trigger for enhanced accuracy
• Free-floating M-LOK® handguard
• Integrated ARCA rail for tripod mounting
• SIG-designed 2-port compensating muzzle brake
• Lower receiver compatible with all MCX upper receivers
• Includes 10-round magazine (SigOptics)