The correct box will add $100 as will the original stocks. Yes, 6" barrel (most common). The was the top of the S&W line. I think at least $1,200 as is. More with box and correct stocks.

BTW- "I inherited this from my dad and need help selling it" is exactly why I generally advise against the practice of buying or building "heirloom guns" to leave offspring or other descendants. No guarantee he/she/they will share your interests.

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