I have a Silent Cat as well, it's cool but definitely not "silent!"
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Also be careful shooting one in urban areas. Some municipalities have restrictions on them, such as San Antonio!
In Texas, an air gun is considered a non-powder gun. Under federal law, air guns are not considered firearms due to the fact that their projectiles are expelled by the force of air, a non-explosive force, rather than by the energy created by the explosive force of gunpowder.
Only recently did Texas Parks and Wildlife Division (TPWD) permit the use of air guns to hunt squirrels, subject to certain restrictions. The air rifle must be designed to be shot from the shoulder, expelling a projectile, bullet, or pellet of at least .177 caliber (4.5 mm) with a minimum velocity of 600 feet per second.
It is illegal to hunt game birds or game animals with an air gun in the Lone Star State. If, however, the animal is a non-game animal (non-protected), such as a bobcat, coyote, rabbit, or armadillo to name but a few, it can be hunted with an air gun. Hunting exotics and other nongame animals, such as feral hogs, is also permissible using air guns (Source).