what's this

I bought this at a yard sale for $1 I have no idea what it is? No markings on it at all. Pulling the trigger advances the rod forward.

Hi All, I just returned from a trip to Europe, of course I managed to take pictures of some mechanical devices along the way... Lets see who can guess what they are, grand prize if you can guess all three! #1. This one was relocated from its original location and on display in the village...