Glad you enjoyed the book! Let me know what happens with the stuff in your game!!!
The legal thing would be, well, it'd be huge. And each piece of equipment would require it. There's also a case of just how much the Security Forces are going to give a damn if they catch you with it, which would vary from sprawl-to-sprawl and neighborhood-to-neighborhood. Even trying to do it on a country-by-country basis would be a nightmare, as Shadowrun takes place on, well, Earth.
There's some places the cops would bust you for just having a taser. There's others that won't give a damn about a heavy pistol unless it's loaded with APDS or Explosive rounds or something like that.
For example, in my Winnipeg game, the cops don't care about light pistols, holdouts, and tasers outside of looking to see if the person has a firearms permit for the pistol or holdout. Heavy pistols, they'll check the ammo on, and if you're loaded with gel or stick'n'shock, they'll attribute it to "self defense" and call it a day. If the heavy pistol has normal (or worse) rounds, they'll give the holder a stern talking to while checking their SIN and Permits extensively. Also, they don't care about revolvers, so, yeah, you can still pack that Ruger Super Warhawk in Winnipeg, as long as you have an initial load of gel rounds or such.
And, let's face it, if whatever you're facing isn't backing away after six shots from a Super Warhawk, even with gel rounds, you either need to learn to shoot better, or they deserve whatever you've got loaded into your speedloaders.
Anyhow, it's a nice thought, and I wish we could do something like that rather than a generic number/letter code, but that'd just be, well, huge.