The Sig Sauer MCX Rattler pistol in 5.56 NATO with a 5.5-inch black barrel (brand part no. PMCX-5B-TAP) packs Sig’s short-stroke gas piston MCX platform into an ultra-compact AR-pattern pistol, built for shooters who want a maneuverable rifle-caliber platform in a short footprint. Sig Sauer equips the pistol with a fast 1-in-5 rifling twist to stabilize a wide range of 5.56 loads, and the semi-auto action feeds from a 30-round magazine. Among AR-pattern semi-auto handguns, this MCX Rattler configuration favors shooters who want a compact, rifle-caliber pistol platform.

Key Specifications

• The chambering is 5.56 NATO/.223 Remington.
• Capacity is 30+1 rounds.
• The barrel measures 5.5 inches, finished in black.
• The rifling twist rate is 1-in-5 inches, stabilizing a wide range of 5.56 loads.
• The action is semi-automatic.
• The unloaded shipping weight is 8.85 lbs.
• The operating system is short-stroke gas piston.
• The platform is AR-pattern, sized for an ultra-compact rifle-caliber pistol.
• The pistol ships with one 30-round magazine.

Frequently Asked Questions

What magazine capacity does this pistol use? A 30-round 5.56 NATO magazine.

How short is the barrel on this pistol? 5.5 inches, giving it an ultra-compact footprint.

Buy the Sig Sauer MCX Rattler, 5.56 NATO

A maneuverable rifle-caliber platform in an ultra-compact footprint is exactly what this Sig Sauer MCX Rattler delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.