I have a clone derringer, in great condition. It is black. I just found dripping to be an inconvenience over tanks so it has been sitting on my desk doing nothing. Made about 3 or 4 builds on it, works fine, just not me.

The alan key that comes with it is a bit tacky and sometimes feels like the grub nuts are rounded but if you use a different key they are fine, so it is clearly the key. There are also spare unused grub nuts in case you have concerns.

$10 pickup or if you want to include shipping thats fine.