How much could I get for this AR Upper Receiver?

I have a 7.5 inch upper receiver that I might want to sell depending on the price. It has a standard military upper with forward assist and spikes tactical dust cover. A spikes tactical bolt carrier and M16 bolt also from spikes. The barrel is a Lother Walther 7.5 inch with 1/7 twist. Also there is a Yankee Hill... show more I have a 7.5 inch upper receiver that I might want to sell depending on the price. It has a standard military upper with forward assist and spikes tactical dust cover. A spikes tactical bolt carrier and M16 bolt also from spikes. The barrel is a Lother Walther 7.5 inch with 1/7 twist. Also there is a Yankee Hill free float carbine length quad rail with Magpul MBUS front and rear sights. I think it has around 350 rounds through it total. What do you think I could ask?
Update: Also it has a vortex flash hider
2 answers 2