FFL who pins magazines?

Hey! I’m currently trying to purchase an Echelon 4.0c. The bundle comes with 5 magazines. All 5 are over 10 capacity.

I called the store and they told me they can’t (won’t) pin them and said I can have it shipped to an FFL that pins magazines.

Honestly, I just like the look of the gun with the extended magazines which is why I want them pinned.

Does anyone know of a FFL in or around the Seattle area?

Thanks!