No such thing as a 2 caliber gun. That would be a bullet 1/50th of an inch in diameter. Basically, .22 LR ammo may be fired from a gun marked .22LR. It MAY be possible to fire it from a gun marked .223 or 5.56 mm WITH THE USE OF AN ADAPTER.
this particular item is a .22 cal. pellet gun
40-150
10-100 USD maybe
Gun shop, gun show, Egunparts
Try gun show, gun shops, want ads, e-gunparts.com
Chipmunk
No
Wee Wee!
Blue Book of Gun Values
Gun shop, gun show, on line search,
10-500 USD or so depending on the specifics.
Yes it is possible. Modern Airguns have that capability.