Description
The Shop MCX-SPEAR 6.8X51 SBR is a factory-built short-barreled rifle from SIG SAUER, designed around the military-adopted 6.8x51mm (.277 SIG FURY) cartridge. This SBR configuration features a durable hard-coat anodized aluminum upper and lower receiver set, paired with a cold hammer-forged barrel for exceptional longevity. It is engineered for direct compatibility with the full range of MCX-SPEAR LT accessories and handguards, offering a compact, high-performance platform.
Key Features
- Chambered in the high-pressure 6.8x51mm (.277 SIG FURY) cartridge.
- Factory-configured SBR with a compact, maneuverable barrel profile.
- Features SIG’s proprietary hard-coat anodized 7075-T6 aluminum receiver.
- Integrates the MCX-SPEAR LT’s improved ambidextrous controls and folding stock interface.
- Cold hammer-forged barrel ensures sustained accuracy and extended service life.
Specifications
| Caliber / Type | 6.8x51mm (.277 SIG FURY) SBR |
|---|---|
| Material | 7075-T6 Aluminum |
| Finish | Hard-Coat Anodized |
| Compatibility | MCX-SPEAR LT Handguards & Accessories |
| Weight | N/A |
The 6.8x51mm cartridge delivers a significant ballistic advantage over legacy calibers, with a hybrid case design built for 80,000 PSI pressures. This SBR platform leverages SIG’s short-stroke piston system, which reduces fouling and heat transfer to the action. This design is optimal for suppressed use and maintains reliability in a compact, hard-use package suitable for tactical applications and advanced shooting disciplines.




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