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I don't know if he is any good as a lawyer, but Mark Knapp sure has a nice website on the subject, and his office will answer simple questions for free at (253) 202-2081. He works out of Federal Way and will work in Everett:
http://www.firearmslawyer.net/
As for your actions and the law:
You obviously screwed up when you admitted you had a gun when you didn't have a valid CPL. However, you screwed up FAR more by admitting you had a weapon at all. You don't have to admit having a weapon during a random questioning on the street so don't. Don't lie of course, just respond only with questions and try to get the officer to admit you are being detained (or that you aren't, and then walk away). I suggest responding to his questions with questions, and follow each question with "also, am I free to go?". ("Excuse me sir, are you carrying a firearm?", "Why officer, has there been a report someone around here has a gun? Also, am I free to go?"). Respond to any statements with "How can I help you officer?" (since he didn't ask a question), and "Am I free to go?". After you ask if you are free to go a few times, if he hasn't committed either way (they are trained to also always ask questions too, and they are better at it than you), then state "If I am not being detained then I am going to be on my way.", give him a second to respond, then walk away. This will probably force him to detain you by saying "Halt", or something similar.
Once you are detained he will probably search you, and that is where you might have just gotten the best defenses possible, Florida vs. J.L.:
http://forum.nwcdl.org/index.php?action=downloads;sa=view;id=26
If their tip about you was anonymous (which seems likely so far) then under Florida vs. J.L. they would have had no Terry stop, no legal search, and you could have the firearm and knives suppressed, which stops the case entirely.
As for .270, a good lawyer will get you off on two sections:
"time and place". A store that sells weapons is a much more appropriate place to display a weapon than a normal store, even if it is a gun in a store that only sells knives. The fact that other privately owned weapons have been displayed and discussed in the past (assuming you can get someone else to testify to this fact) sets you up REALLY well on this point. You are even better off if they have ever purchased a weapon (even non-gun) from anyone and will testify to this. That makes it a valid part of their business to view other deadly weapons.
"under circumstances". If your story is accurate then the fact that you were standing there with the clerk and a woman pretty much kills "under circumstances". You also clearly had permission of an employee, which is also kills this requirement. Since you handed a knife to the woman, that shows it was a simple discussion, also killing this requirement. If they know who called it in, and that person admits to having watched for a while before calling it in, and/or they admit to knowing that the woman asked you about the weapons, you are golden. That means they KNEW the situation didn't warrant alarm. Finally, the fact that the employee displayed a weapon as well puts the final bullet in the head of this requirement. Clearly if the employee is displaying a weapon and then everyone puts all their weapons away there is nothing happening that warrants alarm.
The only way you could possibly get close to being nailed on this is if the person that called in the MWAG was someone who saw you through the window of the store just as you pulled out the gun, so they had no context. However, even that would not stick because your actions still didn't warrant alarm, they were just misunderstood by that one person.