Good players on the enemy team

I crafted an Unusual Soviet Strongarm with the effect Showstopper. There is no price for it on backpack.tf so how much do you think it's worth, probably not more than 20 keys but I want price suggestions from the TF2 community. Thanks in advance!

I'm Rohkeli, I just joined these forums although I have been playing on Blw servers for a long time. My favourite servers are the Deathrun servers. yeah.. so.. that was all... thanks