Description
The Real MCX-SPEAR is a premium, factory-original upper receiver assembly from SIG Sauer, designed for the next-generation MCX platform. This complete upper features a durable 6.75″ cold hammer-forged barrel with a hard-coat anodized finish, optimized for the .300 BLK cartridge. It stands out with its monolithic top rail, fully ambidextrous controls, and a short-stroke piston operating system for enhanced reliability and cleaner operation compared to direct impingement.
Key Features
- Factory SIG Sauer MCX-SPEAR upper receiver assembly.
- Chambered in .300 Blackout with a 6.75″ cold hammer-forged barrel.
- Short-stroke piston gas system for reliable, cleaner operation.
- Monolithic M1913 Picatinny top rail for secure optic mounting.
- Fully ambidextrous non-reciprocating charging handle and bolt release.
Specifications
| Caliber / Type | .300 Blackout / Upper Receiver Assembly |
|---|---|
| Material | Aluminum Alloy / Steel |
| Finish | Hard Coat Anodized |
| Compatibility | SIG MCX-SPEAR, MCX VIRTUS, & Rattler Lower Receivers |
| Weight | Approx. 4.5 lbs (upper only) |
The MCX-SPEAR’s short-stroke piston system redirects gas to operate the bolt carrier, keeping carbon and heat away from the action. This design increases reliability with suppressed fire and varied .300 BLK ammunition, from subsonic to supersonic loads. The cold hammer-forged barrel provides extended service life and consistent accuracy, making this a professional-grade system built for demanding use.
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