The evolution of this Sig Sauer P365 has been an extensive journey in mechanical refinement. Originally purchased as a P365 SAS (Sig Anti-Snag) model, the initial appeal was the innovative Meprolight flush-mounted FT Bullseye sight. However, after the first range session, it was clear that the "anti-snag" trade-offs didn't align with my performance expectations.
Leveraging my background as a gunsmith, I began a comprehensive overhaul. Today, very little of the factory original parts remain; only the FCU housing, trigger bar, and takedown lever have been retained.
Frame and Recoil Management
To improve the ergonomics and weight distribution, I swapped the factory frame for a Wilson Combat grip module weighted with tungsten rods. This added mass significantly assists in stabilizing the platform. To further mitigate the "snappy" recoil characteristic of micro-compacts, I upgraded the recoil spring assembly and added a micro-compensator thread cover.
Slide and Optics
The SAS slide was replaced with a standard optics-ready profile to allow for a Holosun red dot paired with suppressor-height iron sights, a necessary upgrade for faster target acquisition and co-witness capability.
The Firearm Control Unit (FCU)
The most recent, and perhaps most impactful, modification was the installation of the MCarbo flat short-stroke trigger. While I won't provide a full technical teardown here (MCarbo offers excellent video resources for that), the difference is night and day.
By pairing this trigger with a full spring kit and a custom trigger job, the results are professional-grade:
Weight: A clean, crisp 3.5 lb break.
Feel: A solid, defined wall with minimal overtravel.
Geometry: The flat face offers more consistent leverage than the original curved shoe (pictured below for comparison).
While some suggested reverting to stock and simply purchasing a Spectre Comp, the level of personalization and mechanical precision achieved through this build makes it a far superior tool for my specific needs.