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,
22 cal semi auto ww2 style gun 22 cal semi auto ww2 style gun
10-500 USD or so depending on the specifics.