i won 2 winchester

i won 2 winchester on blakmarket and why i cant sell or trade one of this weapon what should i do with 2 of the same weapon , maibe is ppl hwo have 2 tomson or other weapons , make somethingh to could exchange the weapone .i pay the crates on blak market and why i cant sell, or trade ,or get ride of the unlike weapon what i have in my storage. ty and think of that