While watching an anime (won't say which one, let's see who can figure it out), I saw a (red colored) gun that could fire explosive bullets with remote controlled detonation.
I'd wager the gun itself is a medium pistol type (-2 AP DV 2d10+2), but the real trick comes from the bullets meshed to the gun or the shooter himself. when the bullets' inside explosives are detonated, each cause 1D10+5 per bullet detonated. Only the bullets that hit a target will detonate (not necessarily in the one aimed, mind you. Critical failure could provide funny surprises!). Note that a bullet stuck in a bullet proof vest will also detonate, though I'm not sure it will cause any armor piercing or or ignoring the armor, being inside the armor already.
it goes without saying that the explosion ignore any armor, including armored skin, because it's already in the body.
It also goes without saying that this gun and its ammo blue print is extremely rare, and thus extremely expensive, attainable only with a high level of G-rep (level 4) or even higher in C-Rep (level 5) if you are working for some hypercorp of the PC.
The rarity of the item (by that read: near uniqueness) could provide some plot hook for a campaign. Either to use the gun yourself or as evidence in a case
Remember The Cant!