SIG SAUER MCX-LT 5.56 NATO 16-Inch Rifle

SIG SAUER MCX-LT 5.56 NATO 16-Inch Rifle

The SIG SAUER MCX-LT is a modern semi-automatic rifle built around the adaptable, bufferless MCX operating system. This black 5.56 NATO configuration uses a 16-inch barrel and ships with one 30-round magazine, giving shooters a full-length general-purpose setup for range use, training, property defense, and other lawful applications. Its folding stock, piston-driven action, ambidextrous controls, and optics-ready upper distinguish it from a conventional direct-impingement AR-pattern rifle.

Short-Stroke Piston Operation

At the center of the MCX-LT is SIG SAUER’s short-stroke gas-piston system. Because the action does not depend on a traditional AR buffer tube, the rifle can use a side-folding stock while remaining mechanically self-contained in the upper receiver. The piston arrangement also keeps hot propellant gas concentrated toward the front of the firearm instead of routing it directly into the action. For the owner, that design supports the compact handling and modular character for which the MCX family is known.

SIG SAUER pairs the system with a cold-hammer-forged carbon-steel barrel. This exact variant has a 16-inch barrel chambered for .223 Remington and 5.56 NATO ammunition, along with a 1:7-inch twist rate. The fast twist is a versatile choice across many common 5.56 bullet weights. A factory flash hider is fitted at the muzzle, and the current MCX-SPEAR LT family uses SIG’s suppressor-ready QD interface. Always confirm compatibility and follow the instructions supplied with any muzzle device or suppressor before installation.

Ergonomics and Controls

The MCX-LT platform is designed for efficient operation from either shoulder. Its control layout includes ambidextrous features, including bolt-catch and bolt-release access, while the flat-blade match trigger provides a familiar straight trigger face. The folding stock includes an adjustable cheek piece, helping the shooter establish a repeatable head position with different sighting systems. With the stock extended, the listed overall length for this model is 35.1 inches.

The lightweight aluminum handguard supplies generous mounting space for compatible accessories while keeping the front end streamlined. An uninterrupted top rail supports red-dot sights, magnified optics, and other compatible aiming systems. This rifle is sold without iron sights, so the owner can select an optic and backup-sight arrangement appropriate to the intended use. Sling and light placement can likewise be tailored without changing the rifle’s core configuration.

5.56 NATO General-Purpose Configuration

A 16-inch 5.56 NATO rifle balances usable ballistic performance with practical handling. It is suitable for shooters who want an MCX that retains a conventional rifle-length barrel while gaining the platform’s folding-stock capability and piston operation. The included 30-round magazine supports a listed 30+1 capacity where lawful. Magazine capacity and firearm configuration restrictions vary by jurisdiction, so purchasers should verify all state and local requirements before ordering.

The black finish gives the rifle a low-profile appearance and coordinates easily with common optics, slings, lights, and support equipment. The 16-inch configuration also avoids the additional federal requirements that can apply to short-barreled rifles, although all buyers remain responsible for compliance with applicable laws and transfer rules.

Key Features

• Caliber: .223 Remington / 5.56 NATO
• Action: Semi-automatic, short-stroke gas piston
• Barrel: 16-inch cold-hammer-forged barrel
• Twist rate: 1:7 inch
• Capacity: 30+1 rounds with one 30-round magazine included, where lawful
• Stock: Side-folding design with adjustable cheek piece
• Controls: Ambidextrous operating features
• Sight setup: Optics ready; no sights included
• Finish: Black
• Overall length: 35.1 inches as listed

What’s Included

The package includes one SIG SAUER MCX-LT rifle and one 30-round magazine. Optics, iron sights, sling, light, and other accessories are not included unless separately stated by the retailer. Review the owner’s manual before use, follow safe firearm-handling practices, and use only ammunition and accessories approved for the rifle.

Manufacturer part number: RMCX556N16BLTB
UPC: 798681683321