SIG SAUER MCX-SPEAR Rifle – 6.8x51mm NATO (.277 SIG FURY), 16″ Barrel, Collapsible/Folding Stock, Coyote FDE Finish, 20-Round
The SIG SAUER MCX-SPEAR RSPEAR6816BNG is a premium semi-automatic rifle chambered in 6.8x51mm NATO / .277 SIG FURY, built on SIG SAUER’s next-generation MCX platform. Designed for advanced performance and modularity, the MCX-SPEAR combines a powerful hybrid cartridge with a short-stroke gas piston system, ambidextrous controls, and a rugged folding/collapsible stock configuration.
The MCX-SPEAR features a 16-inch barrel, Coyote FDE finish, and a folding/collapsible stock with a 1913 interface. The rifle incorporates a reinforced free-floating M-LOK handguard, full-length Picatinny optics rail, and a modular design that allows configuration changes between 6.8x51mm, 7.62x51mm NATO, and 6.5 Creedmoor platforms.
Built around SIG SAUER’s adjustable gas piston operating system and rotating bolt design, the MCX-SPEAR includes a non-reciprocating side charging handle, standard AR-style charging handle, fully ambidextrous controls, and a SIG SAUER 2-stage Match-Duo trigger. This configuration includes a 20-round magazine and is optimized for users seeking a modern large-caliber rifle platform with enhanced range and modular capability.
Specifications
| Feature | Specification |
|---|---|
| Manufacturer | SIG SAUER |
| Model | MCX-SPEAR |
| Model Number | RSPEAR6816BNG |
| Caliber | 6.8x51mm NATO / .277 SIG FURY |
| Action | Semi-Automatic |
| Operating System | Short-Stroke Gas Piston |
| Bolt Type | Rotating Bolt |
| Barrel Length | 16 inches |
| Finish | Coyote FDE |
| Receiver Material | Aluminum |
| Handguard | Free-Floating Reinforced M-LOK |
| Stock | Collapsible/Folding Stock |
| Magazine Capacity | 20 Rounds |
| Magazine Type | SR-25 Pattern Magazine |
| Trigger | SIG SAUER 2-Stage Match-Duo Trigger |
| Safety | Ambidextrous Safety Selector |
| Controls | Fully Ambidextrous |
| Charging System | Side Charging Handle + Standard M4-Style Charging Handle |
| Optics Mount | Full-Length Picatinny Rail |
| Muzzle Device | Suppressor-Ready QD Muzzle Device |
| Barrel Configuration | 16″ Rifle Configuration |
| Platform | Modular MCX-SPEAR System |
Key Features
- Chambered in 6.8x51mm NATO / .277 SIG FURY
- Full-length 16-inch barrel
- Advanced MCX-SPEAR modular rifle platform
- Short-stroke adjustable gas piston system
- Folding and collapsible stock
- Reinforced free-floating M-LOK handguard
- Full-length optics rail
- Fully ambidextrous controls
- Non-reciprocating side charging handle
- SIG SAUER 2-stage Match-Duo trigger
- Suppressor-optimized design
- Coyote FDE finish
- 20-round magazine capacity
The SIG SAUER MCX-SPEAR 6.8x51mm NATO Rifle represents the latest evolution of SIG’s modular rifle technology, delivering increased cartridge performance with a compact 16-inch configuration. Combining the MCX family’s piston-driven reliability with the advanced 6.8x51mm hybrid cartridge, it is designed as a modern precision-oriented rifle platform with extensive customization options.



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