>>64217820
Oh, that's different and you lucked out that I replied. I designed a system basically as you describe (less radar, more on that in a second) about 10 years ago. You are thinking slightly too small. The sensor and FCS solution don't need to be part of the package on the weapon mount, and shouldn't be. What you want is a distributed fires net, where the weapon assembly just has a sighting system that allows it to be fired on the provided solution in near real time, and then different FCSs can give it solutions without limiting it to the single sensor you would otherwise package it with. Ie the solution is a new kind of distributed real time fires net (the buzzword at the time was sensor-shooter fusion).
The key things the weapon mount needs to be able to do are (in near real time) receive and display the firing solution relative to weapon bearing, provide its position to an FCS (not real time if static), mount to the weapon and retain zero.
A ghetto solution is a rugged smartphone with a decent mount. Cost per unit is a few thousand at the ghetto level. The minimum componentry required on the weapon end for mobile/dynamic tasking is a mount, gyro, gps/ins, display, rx/tx, power, inputs. For static, omit gps/ins and tx.