The Sauer 404 Synchro XTC Stock/Receiver Assembly stands as the absolute flagship of mountain and backcountry hunting chassis systems. This ultra-premium foundational unit pairs an elite, aviation-grade aluminum receiver action with a hand-laid, resin-sealed carbon fiber thumbhole stock. This specialized composite construction delivers extreme structural rigidity and phenomenal recoil absorption while aggressively trimming physical carrying weight. Engineered with a fully integrated, adjustable stock comb that lets marksmen quickly dial in perfect cheek geometry, the chassis incorporates J.P. Sauer & Sohn's proprietary Sauer Universal Mount (SUM) interface directly into the action walls to guarantee a flawless return-to-zero when swapping optics. Complete with a four-position adjustable DX2 match trigger module and an ambidextrous manual cocking slider for total safety on the move, this modular powerhouse is fully compatible with all S404 components to build an incredibly nimble precision system.