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SIG Sauer MCX Rattler 300 Blackout Pistol - Romeo 4T - Coyote

Manufactured by Sig Sauer
Manufactured by Sig Sauer
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NOTE: Limit 3 per household. Quantities exceeding 3 will not allow checkout.

Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal Firearm License holder.
•Current processing time is approximately 14 to 16 days.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers. Due to Covid-19 many are no longer open
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



The Sig Sauer MCX Rattler is a highly adaptable, versatile and reliable semi-auto pistol. The MPX offers the highest level of operator safety with unmatched in-field adaptability and the reliability you have come to expect from a Sig firearm. It features a Cerakote finished receiver and a 5.5-inch barrel chambered in .300 AAC Blackout. The MCX Rattler comes equipped with the new Sig Sauer Pivoting Contour Brace (PCB) giving pistol users a brace that easily swivels to adapt to the movement of the shooter's arm and can be rapidly deployed. This MCX features a Romeo4T for short and medium range engagements. This optic provides eye relief and easy target acquisition in all scenarios. The Romeo4T offers four different reticle options (Dot, CircleDot, Dot with Holds, and Circledot with Holds). It boasts a strong, lightweight 7075 Aluminum housing and is fog-proof, waterproof and submersible up to 20 meters for optimal durability. The combination of a CR2302 battery, solar power and the MOTAC system the Romeo offers in excess of 100,000 hours of battery usage. The Sig Sauer MCX Rattler with the Romeo4T is a compact and versatile weapon for the operational minded shooter.

  • Manufactured by SIG Sauer
  • .300 AAC Blackout
  • One 30-round steel magazine
  • 5.5-inch barrel
  • Romeo4T Solar Red Dot Sight
  • Polymer grip
  • Carbon steel barrel
  • 1:5 twist rate
  • Coyote Cerakote finish

Sig Sauer is a world-renowned firearms manufacturer with a rich history of innovation and design leadership. No other firearms manufacturer is so highly regarded and so universally respected for the quality, reliability, and safety of its products. Since 1864 they have expanded their product line to include suppressors, optics, ammo, and airguns to provide customers with a greater range of firearms and equipment.
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Barrel Coating
Barrel Length5.5
BrandSig Sauer
Caliber Gauge300 Blackout
Gas System TypeShort Stroke Gas Piston
Twist Rate1:5

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