comrade raoul
Explorer
It irks me that archaic armor is about as good protection against a hail of bullets as the best modern stuff -- why would it be obsolete? (Platemail provides a +8 equipment bonus with a +1 max dex bonus; the best modern armor provides a +9 equipment bonus with a +0 max dex bonus). It's plausible that archaic armor is that good against melee weapons or archaic ranged weapons, but not against ballistic weapons.
The fix, I think, is to evaluate the equipment Defense bonuses of archaic armor against ballistic damage as though the wearer were nonproficient. The idea is that the armor might help a little bit, but it really wasn't designed to defend against bullets (and doesn't armor proficiency mean you can take advantage of the defense the armor was built to have?). So leather armor provides a +1 Defense bonus (it's about as good as a leather jacket); a chainmail shirt provides a +2 (but a +5 against other, non-ballistic attacks) and a suit of plate mail provides a +3. Sound good?
The fix, I think, is to evaluate the equipment Defense bonuses of archaic armor against ballistic damage as though the wearer were nonproficient. The idea is that the armor might help a little bit, but it really wasn't designed to defend against bullets (and doesn't armor proficiency mean you can take advantage of the defense the armor was built to have?). So leather armor provides a +1 Defense bonus (it's about as good as a leather jacket); a chainmail shirt provides a +2 (but a +5 against other, non-ballistic attacks) and a suit of plate mail provides a +3. Sound good?