Flechette Round Rule Confusion (especially pertaining to shotguns), Please help an old SR3 player just moving to SR4 understand this. Options

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Let me begin by apologizing to everyone if this question has been asked before, but I did a search and could not find it on the board; I was equally not able to turn up the answer to my question when reading the SR4 errata.

I am experiencing some confusion understanding the rules pertaining to flechette rules (especially in relation to shotguns) in SR4.

I have played Shadowrun from version 1 to 3, but am just now taking up version 4, so I do have some background knowledge as to game concepts, but I am really baffled here. A lot of changes from SR2/3 to 4! (IMG:style_emoticons/default/rotate.gif)

When I read the rules for the shotguns firing buckshot with a tight choke, it tells me to use standard damage values of +2DV, +2AP. Okay, that I understand. But on the same page, it says to use the rules for flechettes when firing buckshot.

So I look up the rules for flechettes later in the SR4 sourcebook, and it tells me that they are +2DV, but "the effective value" for Impact Armor is adjusted +5AP. This is where I am confused.

When it says "the effective value" above, does that mean that the effective value of the Impact Armor is +5AP only to determine if it inflicts Stun vs. Physical damage? Or is it +5AP instead of +2AP as noted in the shotgun rules? I am quite confused.

On an off-topic, as someone who has fired 3-inch 00 buckshot...that stuff can kill a black bear! I can understand some regular shot being tame but...I guess that's just my opinion. Why SR has always made it so weak is beyond me. I don't know anything about real-life body armor so for all I know it might stop buckshot...