PolarStar Kythera SA Main Sear

Keep your Kythera SA trigger work precise and risk-free with a genuine spare main sear. Designed for builders and technicians who want to experiment with trigger tuning without compromising their primary sear, this OEM component is built to last.

• Compatibility: Original main sear used with all Kythera SA models.
• Material: 4140 steel, chosen for high strength and predictable performance under cycling.
• Finish and Hardened: Gas nitride case hardened for wear resistance, reduced galling, and longer service life.
• Purpose: Spare main sear intended for maintenance, tuning, and safe experimentation with trigger feel.
• Quality and Provenance: Official part designed to match the factory tolerances and engagement geometry of Kythera SA systems.
• Installation Notes: Intended as a spare—swap in during servicing, following standard Kythera SA maintenance procedures.

This spare sear helps you refine trigger performance—achieving a crisper break and more consistent reset—without risking your primary sear during adjustments. The 4140 steel base paired with a gas nitride case hardened finish delivers durable wear resistance through many cycles, reducing downtime and maintaining reliability across field sessions or range days. Ideal for technicians, builders, and serious enthusiasts who value precise engagement and long-term component longevity.