[Charles Martel]

Ah, the heady days of mail order and the classified ads in the back of Boy's Life Magazine. :-)

This one pictured sold on Gunauction.com for over $200.00. I don't think it cost much more than $20.00 new. It was really a toy compared to the "real" airguns of the day.

[ozzymandus]

One of the gun magazines actually ran an article on the freon-powered BB machine gun back in the day. Freon cost about $1/can back then. Now you have to be a mechanic to buy real freon, and it costs a bunch.

[BloodScarletMinnesota]

That's it!
Those things were so fun, every kid 9 thru 13 wants one.
Not enough range though, so make sure to have a pellet gun
Thanks for the pic, sure brings back memories.