Sig Sauer MCX Rattler 300 Blackout Pistol – 5.5" Barrel, Folding Brace, Black
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For a Limited Time: Buy a New P211, P320, M17 or M18 Handgun Between 10/15/2026 and 12/31/2026, Receive One (1) Allegiance Flag Supply 3' x 5' American Flag (SKU: MKT0678)
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EBERLESTOCK FADE SLING BAG CONSUMER PROMOTION
For a Limited Time: Buy a New P365 Handgun Between 10/15/2026 and 12/31/2026, Receive One (1) EBERLESTOCK Fade Sling Bag (SKU: PS9005602)
October 15 through December 31, 2026
Description
The Sig Sauer MCX Rattler in 300 Blackout delivers maximum firepower in the smallest possible package. Engineered for close-quarters performance, this ultra-compact piston-driven platform features a 5.5-inch barrel, full-length Picatinny top rail, and PDW-style folding brace.
The Rattler’s gas piston system is optimized for suppressed or unsuppressed use, providing exceptional reliability in any environment. Its minimalist design keeps the platform lightweight and maneuverable without sacrificing performance. This model comes equipped with a Magpul QD sling, a 20-round Lancer magazine, and a Sig three-prong flash hider.
Built on the proven MCX architecture, the Rattler is a favorite among professionals and enthusiasts looking for a compact, mission-ready firearm that can adapt to any scenario.
Specifications
| Specification | Detail |
|---|---|
| Manufacturer | Sig Sauer |
| Model | MCX Rattler |
| Caliber | 300 AAC Blackout |
| Barrel Length | 5.5" |
| Action | Gas Piston, Semi-Auto |
| Brace Type | Folding PDW Brace |
| Handguard | M-LOK Compatible Aluminum |
| Receiver Finish | Hardcoat Anodized Black |
| Trigger | Single Stage |
| Muzzle Device | Sig 3-Prong Flash Hider |
| Capacity | 20+1 |
| Magazine Type | Lancer Polymer |
| Overall Length | Approx. 23.5" (folded: ~16") |
| Weight | Approx. 5.7 lbs |
| Included Accessories | Magpul QD Sling, Lancer Magazine |
| Country of Origin | USA |
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