I hope this is not a decision you need to make soon.
I don't plan on croaking soon.I don't have any kids and my wife does not like guns.I am the only person in my family that likes guns.As strange as it sounds it was my wife that asked what to do with them if i die.
+1 for that!!When I die I plan on being buried inside my locked safe with my guns.
My son...a few were given to me so I will do the same to him. I have one rifle that I refuse to sell or trade and that is my garand which will be his.
This almost brought a tear to my eye, I sometimes think in his perspective about what he will, one day give to me.
sorry for the hi-jack
Here's my serious answer to your serious question. The two boys have 'picked out' what they would want. My wife gets her favorites also. Everyone knows what they want ahead of time. The daughter doesn't want anything so she gets the money from whatever is left.
My point is: make a plan. That way there is no fighting over the guns. The guns are separate from the rest of the estate which will go to my wife. Write it out and check with all parties so there are no questions. Make a will. Keep it up to date.