The Atrius ADG-FRS-AMBI-X ("X-Series") is a gas-piston-specific ambidextrous forced-reset selector built with a different trip system (trip base and trip clutch) than Atrius's standard AR-15 models, designed for platforms whose bolt carriers don't present the same trip surface as a mil-spec AR-15 carrier. It targets SIG Sauer piston-driven guns — including MCX, MCX-Spear LT, MCX-Rattler LT, and MPX/MPX-K/MPX Copperhead — delivering the same Safe/Semi/Super-Semi forced-reset function as Atrius's AR-15 line, adapted for those platforms' mil-spec-pattern triggers.
- Type : ambidextrous 3-position forced-reset selector (Safe/Semi/Super-Semi), X-Series trip base/trip clutch design
- Platform Compatibility : SIG MCX, MCX-Spear LT, MCX-Rattler LT, MCX-Spear LT Upper AR Conversion Kit, MPX, MPX-K, MPX Copperhead
- Trigger Compatibility : mil-spec-pattern single-stage triggers without U-notch/relief cut
- Material : heat-treated 4140 steel; corrosion-resistant finish
- Installation : drop-in, no modification
- Note : does NOT cover full-size .308-pattern or .277 FURY Spear platforms
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