On a case-by-case basis, but they usually have no problems with trading in arms.
They accept firearm trade-ins, and in my experience offer very competitive values on items in good shape.
Mazama does buy or trade used guns, if it is something they think they can resell without any problems. Can't hurt to take it in and ask them. =)
Depends if what you have us what they need or want, and what it is worth.
Thanks! Your answer is awaiting moderation.