Guild Wars 2

I have a thief that uses double pistols (both main and off hand weapons). The off hand pistol has a Minor Sigil of Luck – Gives stacks of magic find. I also have double daggers. If i were to stack the Sigil of Luck to 25 stacks on my pistol and swap to the daggers using `, would the magic find buff still apply? (the stacks on the boon is still next to my other passives that I have).

Yes, they stay there until you die, logoff or waypoint (to another area iirc).

So the passive still applies even after swaping to your next weapon nice!!