michigan
Write to the Manufacture or go online to the gun maker and request a manual.
In the state of Michigan, not only can a felon not own a gun, if he is caught in close proximity to a gun, no matter how disabled it is or impossible for him to access, he can and will often be charged with Felony Firearms.
HI Standard
No
carbon
21 for hand gun 18 for long gun
Blue book of gun values
For Colt, go to proofhouse.com
No
Yes.
Send it back to the manufacture or contact the manufacture to find out who repairs your BB gun.