Value and where to sell? 1917 DWM MILITARY ARTILLERY

[Sharpsh**ter]

I've had this 1917 military artillery for several years now but due to some recent issues, as well as inheriting 183 firearms, I'm looking to separate with it, sadly. What's the best route to take in finding a potential buyer and what should be the lowest I'd accept? I have a price in mind based off of blue book, but it's an out of date version. Anything helps and TIA. Pm for my number if it's not to be discussed on this forum. I'm easier to get ahold of texting because I'm constantly working but I'll try my best to answer calls