Description
The MCX-SPEAR in 6.8x51mm is Sig Sauer’s next-generation short-barreled rifle, engineered for the US Army’s NGSW program. This SBR variant features a durable 6.75-inch cold hammer-forged barrel with a 1:7 twist rate, optimized for the high-pressure 6.8×51 cartridge. The monolithic upper receiver is machined from 7075-T6 aluminum with a hard-coat anodized finish, ensuring maximum rigidity and compatibility with the MCX/SPEAR family of components and accessories.
Key Features
- Chambered in the high-pressure 6.8x51mm (.277 Fury) cartridge for superior ballistics.
- Features a compact 6.75-inch cold hammer-forged barrel with a 1:7 twist rate.
- Patented short-stroke gas piston system with adjustable regulator for reliable cycling.
- Monolithic 7075-T6 aluminum upper receiver for exceptional strength and zero retention.
- Includes a folding, adjustable minimalist stock and M-LOK compatible handguard.
Specifications
| Caliber / Type | 6.8x51mm (.277 Fury) SBR |
|---|---|
| Material | 7075-T6 Aluminum Upper, Steel Barrel |
| Finish | Hard-Coat Anodized |
| Compatibility | MCX/SPEAR Legacy Uppers & Handguards |
| Weight | Approx. 7.5 lbs (unloaded) |
The 6.8x51mm cartridge, with its hybrid steel/brass case, operates at pressures exceeding 80,000 PSI, demanding a purpose-built platform. The MCX-SPEAR’s three-lug rotating bolt, reinforced extension, and adjustable gas system are engineered to manage this stress, providing consistent function and extended service life. This SBR configuration delivers the cartridge’s terminal performance in a highly maneuverable package suitable for dynamic applications.
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