Between $25 and $5000, depending on make, model, age, and condition. None of which you mentioned. Without more information, there is no way to answer your question.
50-200 or so
50-140
50-1000 and up
50-260 or so
50-500 USD or so
50-200 depending on specifics
50-550 usd
$7,325, they only made 11,870 of them. It was one of the first 50 caliber guns made.
50-200
50-2000 or so depending on EXACTLY what you have and condition
50-5000 USD or more depending on specifics
50-500 USD depending on specifics