Okay where to start....
Firstly... augmentation itself says that each cyberlimb mount is treated as a smart firing platform (SFP).
The smart firing platform is in the BBB under weapon accessories, but it's actually a special kind of drone. It's basically an immobile drone w/ a flexible heavy weapons mount and 6 points of RC as it's a motorized tripod. (it's heavy weapons since it can handle mortars and HMG's). I quote the BBB "The platform is equipped w/ Pilot 3, Sensor 3, and one targeting autosoft at rating 3". It's a drone, only drones use that software.
That's why your 'pivoting socket' is a drone in it's own right. And why I said you're putting a drone inside a drone. The SFP already does what you're asking, fires any smartlinked weapon put into it on command.
Next, you badly misunderstand the "remote control" drone rules badly. You can only remote control one drone at a time, just as a true rigger can only jump into one drone at a time. Or are you telling me you can play all 8 players at once playing Quake/UnrealTournament/TeamFortress2. If you're using a 'drone army' (this is a very common tactic btw), then you use a simple action to order all the drones doggy brain autopilots to do the same thing at once. EG: you order all 4 smart firing platforms to fire at Target Y... then on the drones action, each drone will attack using a complex action (rolling Pilot + Targetting autosoft).
The command program section, even says it allows it to control 'A DEVICE" note the singular. Not multiple devices simultaneously. Then under the rigging section under remote-control "you may control only one drone at a time".
I misunderstood you initially as well. I thought you were subscribing 4 drone SFP's, then the 4 gundrones. Issuing 1 set of orders as single action, then waching the SFP fire the gun once, then the gun fire itself again, each pass. That doesn't fly because you now have two autopilots trying to fire the same gun at the same time w/ both of them using a complex action to do it. As I was trying to figure out why the hell would you put 1 point of RC and make the gun SA, when you could only fire it once per round.
Your biggest problem here, is you read the rules, then don't cross reference them w/ the equipment in the other book. You then intentionally read the rules not in the way they're written, but in the way most advantageous to yourself. You completely ignore the text limiting remote-control to one at a time.