Way of the Spellshot for Gunslinger

[Intuxas22]

Maybe I'm just missing it, but I have scoured through all of HLO and do not see a way to take on the Way of the Spellshot archetype for Gunslinger.

When I look at the Spellshot dedication feat at level 2 it has the requirement to have the Way of the Spellshot and be a gunslinger.

Is this something that just didn't get implemented or am I missing something?

side note: I do have Guns and Gears, as well as Advance Player's Guide purchased and selected as source materials.

Thanks in advance for any help you can give me.