Upgrade your SIG MCX or MPX platform with the Atrius Development 3 Position X-Series Super Selector Safety, a purpose-built ambidextrous forced reset selector engineered specifically for gas-piston firearms. This innovative safety selector delivers precise control through three distinct positions-Safe, Semi, and Super-Semi-allowing shooters to maintain traditional semi-automatic function while gaining the mechanical advantage of forced reset in the third position. Key Features 3-Position Operation: Safe, Semi-Auto, and Super-Semi modes provide versatile firing options with a crisp 90-degree throw and positive detents for reliable engagement. Ambidextrous Design: Original Atrius ambi switch with textured, chamfered levers ensures fast, confident thumb activation from either side under stress. SIG-Specific Engineering: Includes dedicated trip base and trip clutch system optimized for MCX, MPX, Rattler, and MCX-Spear LT platforms-no generic AR-15 selector adaptation required. Premium Construction: Machined from heat-treated 4140 steel with a corrosion-resistant black nitride finish for exceptional durability in demanding environments. Drop-In Installation: Seamless fit with no trigger modifications or cutting needed; compatible with mil-spec fire control groups without U-notch or relief cuts. Compatibility and Specifications Platforms: SIG Sauer MCX, MPX, Rattler, MCX-Spear LT Upper AR Conversion Kit Trigger Compatibility: Mil-spec single-stage triggers (no U-notch); select cassette/drop-in triggers Material: Heat-treated 4140 steel Finish: Corrosion-resistant black nitride Throw: 90-degree indexing Origin: Made in the USA Why Choose This Product Traditional safety selectors limit options on SIG gas-piston platforms. The X-Series Super Selector solves this by integrating a mechanically leveraged trip system that forces trigger reset after each shot in Super-Semi mode, enhancing control and follow-up speed without the complexity of full forced-reset triggers. Its robust build withstands harsh conditions while delivering smooth, tactile feedback for confident manipulation in any scenario.