My older brother had a BB gun rifle, lever action to pump the air pressure up.
My parents got me a rifle that shot air. Mine had a bolt or metal pin from one side of the barrel through the barrel so no projectile could be fired, just air.
http://images.craigslist.org/5Gf5K25W53 ... 72152a.jpg" onclick="window.open(this.href);return false;
My rifle shot mud if you load the barrel down to the pin.
Found a mention of it on a forum today and I had forgotten, but remembered breathing vaporized oil ...:
An "Air Rifle" gun fromadd a drop of 3 in 1 [oil] to a small hole and it smoked.
http://www.airgunbbs.com/showthread.php ... ystery-Gun" onclick="window.open(this.href);return false;
Image from old Craigslist ad
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http://www.samstoybox.com/toys/SonicMysteryGun.html" onclick="window.open(this.href);return false;

In the old days everything was simple
Air rifles shot air.
BB guns shot BBs
Pellet guns shot Pellets.
Now it's complicated
Airsoft guns are not even soft.
We need truth in labeling.

I may need to shop ...Daisy Sonic Gun https://www.google.com/search?q=daisy+s ... 27&bih=624" onclick="window.open(this.href);return false;