Questions about armor-piercing ammunition and the Brady Campaign's Five-seveN vest test

[derby378]

From what I can tell, USC Title 18, Part I, Chapter 44, Section 922(a)(8) prohibits the sale of armor-piercing ammunition to civilians, but I don't see anything in Title 18 that prevents civilians from actually owning AP ammo. Are there Federal penalties for civilian possession of AP, or is it relegated to a legal gray area akin to possession of absinthe?

As for the Brady Campaign, they claimed that SS192 rounds fired from a Five-seveN pistol were able to penetrate a Level IIa vest, although the BATFE does not consider the SS192 or the current SS197SR to be AP. Is there any independent data on the vest itself regarding age, condition, brand, etc.?

Many thanks for any info.