Iconic Kappa Missing

[Werlynn]

I've visited the location of the iconic Kappa pistol twice over several hours of game play and it has not spawned yet. Is there some minimum story that I need to complete to get it to spawn? This is the third thing that has not spawned in it's location (the others being the "Gas Gas Gas" car, and the "I'm In Love With My Car" car)

 

[Wragan]

If it's the one I think it is (I only know about one Kappa Iconic), then I had previously found it during (!) a Gig, in Dogtown. (So the spawn location can be right, just not at the time you went there)

Spoiler: Name of the gig:

Gig: Heaviest of Hearts

Also I only did that Gig once, so I have no idea if it remains there after the gig (or whether the area even remains accessible afterwards).