I just got these guns off of craigslist. I found out they were from the 1960s. They are pneumatic guns. I took them to the local dive shop and they told me I should come to this forum because there is bound to be someone looking for parts. Well I'm not sure exactly what parts they are but I have two separate guns, a spear and some bearing that goes on the inside of the gun to transfer air pressure to the spear. I will try to post pictures. I'm willing to sell all of it for 50.