SIG SAUER MCX-SPEAR LT Rifle – 5.56 NATO, 16″ Barrel, Collapsible/Folding Stock, Coyote Finish, 30-Round
The SIG SAUER MCX-SPEAR LT WRMCX-556N-16B-LT-FDE is a modern semi-automatic rifle chambered in 5.56 NATO, built on the latest evolution of SIG SAUER’s MCX platform. Designed for modularity, reliability, and adaptability, the MCX-SPEAR LT combines a lightweight piston-driven operating system with advanced ergonomics, ambidextrous controls, and a compact folding/collapsible stock configuration.
Featuring a 16-inch barrel and a durable Coyote finish, this rifle provides a balanced configuration for users seeking a full-length carbine platform. The MCX-SPEAR LT utilizes a short-stroke gas piston system and rotating bolt design, helping reduce fouling in the receiver while maintaining reliable cycling. The platform includes improvements such as a reinforced free-floating handguard, ambidextrous controls, and enhanced modularity compared with earlier MCX models.
The rifle features a folding and collapsing stock, aluminum M-LOK handguard, full-length Picatinny optics rail, and compatibility with standard AR-pattern magazines. The 30-round magazine configuration and modular MCX architecture make the SPEAR LT a versatile rifle platform for a variety of shooting applications.
Specifications
| Feature | Specification |
|---|---|
| Manufacturer | SIG SAUER |
| Model | MCX-SPEAR LT |
| Model Number | WRMCX-556N-16B-LT-FDE |
| Caliber | 5.56 NATO |
| Action | Semi-Automatic |
| Operating System | Short-Stroke Gas Piston |
| Bolt Type | Rotating Bolt |
| Barrel Length | 16 inches |
| Barrel Twist Rate | 1:7″ RH |
| Barrel Material | Cold Hammer Forged Steel |
| Finish | Coyote |
| Receiver Material | Aluminum |
| Handguard | Free-Floating Aluminum M-LOK |
| Stock | Collapsible/Folding Stock |
| Magazine Capacity | 30 Rounds |
| Magazine Type | AR-15 Pattern Magazine |
| Trigger | SIG 2-Stage Match Trigger |
| Safety | Ambidextrous Safety Selector |
| Controls | Fully Ambidextrous |
| Optics Mount | Full-Length M1913 Picatinny Rail |
| Muzzle Thread | 1/2″-28 |
| Overall Length | Approx. 35.1″ Extended |
| Folded Length | Approx. 26.5″ |
| Weight | Approx. 7.5 lbs |
Key Features
- Chambered in 5.56 NATO
- Full-length 16-inch barrel
- Advanced MCX-SPEAR LT piston-driven system
- Lightweight aluminum receiver
- Durable Coyote finish
- Folding and collapsible stock design
- Free-floating M-LOK handguard
- Full-length optics rail
- Fully ambidextrous controls
- SIG match trigger system
- AR-pattern magazine compatibility
- 30-round magazine capacity
- Modular MCX platform design
The SIG SAUER MCX-SPEAR LT 5.56 NATO 16″ Coyote Rifle combines the proven MCX operating system with modern upgrades, offering a highly adaptable rifle platform focused on reliability, ergonomics, and modular performance.



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