So I live in Utah and am a resident here. My parents live in Wyoming, where Glocks are freaking avaliable. I am 21 years of age. To avoid a transfer fee would it be legal for them to "sign" for a glock and then give it to me? I have never really understood the laws behind signing for someone else. Like when I was 14 and got my hunting rifle, the FFL guy new exactly what it was for because he fit the scope for me and everything. I need some input.

ahh, perfect opertunity to whip out my atf firearm guide book.

Normally purchasing for or transfering to a family member is not considered straw purchases.  And are therefore legal.

On the other hand you reside in a different state so this would be illegal for a handgun.

But if they were buying it as a gift it would be legal.  i.e. they were paying for it.

Tricky ground.

It is illegal for an unlicensed individual to transfer any firearm of any type to another unlicensed individual who is a resident of another state.  The only exception is for firearms that are bequests from an estate.

(Edited to add unlicensed, meaning non FFL holder)