This premium lower parts kit for the SIG Sauer P320 fire control unit (FCU) includes everything needed to complete one's SIG Sauer or MUP 1 build. All of the components in the set are equal or better than the OEM versions.

This is a best-of-breed build solution featuring parts made from polymer, billet steel, or high-quality stamped steel versus MIM (Metal Injection Molding). It elevates the quality of the fire control unit components to an unparalleled level.

All of the parts shown are included except the actual FCU, which is a regulated component. The parts displayed in the official SIG SAUER factory parts diagram, each with the factory number circled in orange beside it, are part of this kit.

Does not contain the frame / FCU, just the parts to complete it.