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Posted: 9/9/2026 12:03:15 PM EDT
| Has anyone received their X-Series FRS’s from Atrius yet? |
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The Atrius Development Group FRS X-Series was designed to be compatible with a variety of Sig Sauer MCX , MPX , Rattler platforms, and even Sig's MCX-Spear LT Upper AR Conversion Kit. Atrius Ambi Selector Switch (original design) Configuration: Safe, Semi, Super-Semi Includes a new FRS lever with dimension compatible for MCX/MPX product lines Universal design for Sig Sauer gas piston platforms Installation: Drop-In Ready (No Modifications Necessary) Platform Compatibility: MCX , MCX-Spear LT , MCX-Rattler LT , MCX-Spear LT Upper AR Conversion Kit , MPX PCC , MPX-K . Compatible with all generations (safety latch may need to be removed in early gens). Trigger Compatibility: Mil-Spec Triggers that come with MCX/MPX platforms. Single stage mil-spec triggers that do not have a u-notch or relief cut. |
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