Folded AK to raise PF (Standard??)

[king_nothing_]

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He raised from early-mid position (5x also) and he's raised 2 out of ~ last 120 hands or something. I'd put him on AK, AA-TT, maybe 99. Perhaps I can squeeze a little profit out of him if an ace or king flops, but you'd think that would be countered by those few times he's got aces or kings and a king flops, or jacks on an AJ5 flop...

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You have 41% equity vs. that range, and you're folding AK for 5BBs to a donk when you have position on him? Do you know how easily most people like him stack off? Your implied odds are great. You should be calling or raising him in this situation with any pair and some unpaired hands as well.

Oh and also, his 2% PFR% doesn't necessarily mean he's only raising the top 2% of hands. Donks love limping AA-QQ, AK, etc.