SIG SAUER Mcx Spear-lt Ir 5.56 Coy 16"
$2,707.69
SIG SAUER Mcx Spear 6.8x51 16" Coy 20+1
Sig Sauer
$4,350.69
(No reviews yet)
Write a Review
Sig Sauer
SIG SAUER Mcx Spear 6.8x51 16" Coy 20+1
The SIG SAUER MCX Spear in 6.8x51mm represents the next generation of semi-automatic rifle technology, purpose-built around the same platform selected for the U.S. Army's Next Generation Squad Weapon program and engineered to deliver unprecedented terminal performance at extended ranges.
- Chambered in hard-hitting 6.8x51mm for superior long-range energy and penetration
- 16-inch barrel balances velocity, accuracy, and overall rifle maneuverability
- Coyote anodized receiver with matching Magpul SL-M collapsible and folding stock
- Optic-ready upper accepts any standard Picatinny-mount scope or red dot
- Ships with one 20-round steel AR-10 compatible magazine for immediate use
- MCX modular platform allows caliber and configuration changes with minimal tools
Who This Is For
The MCX Spear is ideal for serious long-range shooters, hunters pursuing large or dangerous game, and firearms enthusiasts who demand a military-pedigree semi-automatic rifle with cutting-edge cartridge technology. If you want a rifle that bridges the gap between battle-proven reliability and next-generation ballistics — all in a coyote-finished, folding-stock package — this is your platform.
Specifications
| Brand | SIG SAUER |
|---|---|
| Model | MCX Spear |
| SKU / Part Number | RSPEAR-68-16B-NG |
| Caliber | 6.8x51mm |
| Barrel Length | 16 inches |
| Capacity | 20+1 |
| Finish | Coyote |
| Receiver | Coyote Anodized Aluminum |
| Stock | Magpul SL-M Collapsible / Folding — Coyote |
| Sights | Optic Ready (no iron sights included) |
| Magazine Included | 1 × 20-Round Steel AR-10 Compatible |
| Action | Semi-Automatic, Short-Stroke Piston |
| Platform | SIG MCX Modular |
Frequently Asked Questions
What makes the 6.8x51mm cartridge different from standard rifle calibers?
The 6.8x51mm (also known as .277 SIG Fury) is a hybrid cartridge developed specifically for the U.S. Army's NGSW program. It features a steel-case head bonded to a brass body, allowing chamber pressures significantly higher than standard SAAMI cartridges. The result is a round that pushes a .277-caliber bullet to velocities rivaling much larger cartridges, delivering superior terminal energy and barrier penetration at distances beyond 500 yards — making it genuinely more capable than 5.56mm or 7.62x51mm NATO at range.
Is the MCX Spear compatible with standard AR-10 or DPMS magazines?
The MCX Spear ships with one proprietary 20-round SIG steel magazine designed for the 6.8x51mm cartridge. While the magazine is described as AR-10 compatible in profile, the 6.8x51mm cartridge is dimensionally unique, and standard AR-10 or .308 magazines will not feed this caliber correctly. Always use SIG SAUER factory or certified aftermarket magazines specifically rated for 6.8x51mm to ensure reliable function and safety.
Can I change the barrel or caliber on the MCX Spear platform?
Yes — one of the MCX platform's greatest strengths is its modularity. The MCX Spear is designed so that barrels and caliber conversion kits can be swapped with minimal tools, allowing the rifle to be reconfigured for different applications. However, any conversion should use SIG SAUER-approved components, and owners should verify that any new configuration complies with applicable federal and state regulations before completing a conversion.
