Trade-in Values?

[DrPartagas]

Which guns hold best trade-in value? Sig,Glock,Spring, Kimber???

If you group all custom shop guns together and assembly line guns together, which companies retain best value in their gun line?

[paul45]

Nothing holds "trade-in" value. To me that implies involving a dealer, who will rip you off if one allows it. However, best resale value and collector interest for me has been Colt.