I feel that it needs to be stated that everyone involved so far is way too focused on the traditional "slug throwing" firearms. There hasn't even been a single mention of weapons which employ an alternative form of projectile.
Such as the Ares Redline Laser Pistol.
it does 5p damage, (standard heavy pistol damage) "AP -half" resisted with impact. fires in Semi-automatic and costs 7500 nuyen. all that unmodified!
plus you also find a skill to learn, yay karma!
Pg 41 of arsenal for full stats.
For all those that are already saying the GM won't allow it, I believe he did say any gun.