All the accuracy, reliability and operating features of a full-size AR-style rifle in a compact package. Sig Sauers MCX Rattler Pistol uses a 5.5 barrel, short-stroke gas operating system and a three-position telescoping, pistol-stabilizing brace to allow use with just one hand. PDW upper. M-LOK handguards provide attachment points for your favorite accessories. Three-prong flash suppressor. Compatible with standard GI magazines. 19.3 collapsed length. Size: Large-Format Pistols. Type: Pistols.