Electronic Firing doesn't really have anything to do with it. There are caseless weapons today where the CPU controlling the electronic charge can be destroyed and the gun still puts out a single pulse when you pull the trigger. The CPU is only there to recurse the pulse if the firing mode calls for it. Sure, SR
could do it differently, but it would be dumb to make it fundamentally flawed and worse.
Electronic or not, the firing pin/pulser has to be able to withstand the pressure and heat from the explosion that propels the bullet. It cannot be fragile and still function at all. Displaying ammo count (digitally) can be done today with the right magazines.
I can see bricking the ammo count, DNI interface, firing modes, etc. I can't see bricking the physical "I pull the trigger, you go boom" part of the equation though. It just makes no sense. I very seriously feel that it's about as logical as hacking the buttons on clothes to be unable to unbutton. Or throwing knives to not leave my hand (I guess that would make sense if they have gecko grip).
"Destroy" and "disable" are two very, very, very different things. And if a tech function puts something near the firing pin, as an example, the catastrophic failure of that component could cause problems for the firing pin.
Sure, if its more powerful than the bullet going off, which seems unlikely unless the gun was specifically designed to be destroyed in that manner. That's pretty much the point here. The guns would have to specifically be designed to be that bad, because it makes no sense otherwise, and it makes no sense for them to be designed that bad.