Description
The MCX-RATTLER LT Direct from SIG Sauer is a compact, direct-impingement upper receiver assembly designed for maximum versatility. It features a 5.5-inch cold hammer-forged barrel with a 1:5 twist rate, optimized for stabilizing heavy subsonic ammunition. The hard-anodized aluminum upper is finished in a durable black Cerakote and is engineered for direct compatibility with standard AR-15/M16 lower receivers, creating a highly portable and adaptable firearm system.
Key Features
- 5.5-inch cold hammer-forged barrel with a fast 1:5 twist rate
- Direct-impingement gas system for reliable AR-15 platform operation
- Hard-anodized 7075-T6 aluminum upper with black Cerakote finish
- Compatible with standard AR-15/M16 lower receivers
- Includes MIL-STD-1913 rail at 12 o’clock and M-LOK at 3, 6, and 9 o’clock
Specifications
| Caliber / Type | .300 BLK / Upper Receiver Assembly |
|---|---|
| Material | 7075-T6 Aluminum |
| Finish | Black Cerakote |
| Compatibility | Standard AR-15 / M16 Lower Receivers |
| Weight | Approx. 3.5 lbs (upper only) |
The MCX-RATTLER LT Direct’s 1:5 barrel twist is a critical engineering choice for .300 Blackout, providing superior stabilization for heavy 200+ grain subsonic rounds essential for suppressed use. This direct-impingement design ensures reliable cycling with a wide range of ammunition when paired with a standard AR-15 lower and buffer system, making it a practical solution for building a compact, multi-role firearm for defense or recreational shooting.
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