Exciting news for Sig fans! Today Sig announced the release of the P365 Fire Control Unit (FCU). The P365 FCU will be available within a week or two as Sig is ready to start shipping immediately! What is a FCU? For those not familiar, the FCU is the legal receiver / serialized component used in P365's (and also P320's). With the FCU you can build out a custom P365 using a wide variety of parts from many manufacturers.