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Duel SWEP

Just a simple SWEP that makes 1v1 revolver fight more balanced and stylish.
And yes, it's another rush work, made in six hours, and may have tons of bugs.
The SWEP can be located in "Other" tab, and it won't show up in singleplayer.

Take out the weapon and press M1 on another player who is holding this weapon as well to send a duel offer.
The player will get noticed by your offer, then he can either send back an offer to start the duel or switch to another weapon to refuse your challenge.
You can't send offers to players in noclip or too far away.

You cannot pick up items or weapons, and you cannot use anything so it's better open doors around the arena before starting.
Press E+M1 to withdraw, in other words, kill yourself.
You will quickly lose health if you go too far away, don't leave of the white sphere area.

You can press M2 when out of combat to open stats menu, displaying your total duels, wins, accuracy, etc.
You can clear stats by deleting "xdedl_stats.txt" in the data folder.