GOAMCX-BLACK 1/3 Scale Die Cast SIG MCX Model Rifle, Black1: 3 scale version of the SIG MCX done in all die cast metal. Easily twist off the suppressor to reveal the flash hider. Scope tightens onto railing at the position you want. The folding stock functions and is quickly addicting. The SIG SAUER MCX Rattler is a compact, modular firearm designed for close quarters combat. Introduced in the 2010s, it's chambered for various cartridges, like the . 300 Blackout and 5. 56x45mm NATO. It features a short