Second application

Hey, you as you’re probably aware from a previous post, I am new to the WA licencing process - so again, please excuse my ignorance.

So, I currently have an application in for a Glock 17A (currently in 28 day cool off) and after visiting a firearms shop today there is a shotgun I want to purchase. If I purchase and apply for the shotgun, will I pay the “first time application fee” or the additional gun fee? And how will this affect my current application?

Thanks for any help, cheers.