Consult with a good gunsmith.
25-150 USD or so
$50-100, depending on condition.
$100, more or less
No way to tell.
More information needed to determine model of firearm.
"BB" prefix indicates 1985
@ turn of the century; less than 100 USD
Try e-gunparts.com, gun shows, internet, want ads.
H&R made utility firearms from 1874-1986. 50-100 USD
1971
No such thing as 22 "caliper". 22 caliber, yes. 10-100 USD or so
50-100 USD