Without knowing the model, and having some idea of what is wrong or broken on YOUR rifle, the only answer is TAKE IT TO A GUNSMITH. Good questions equal good answers.
Take it to a gun smith.
Proofhouse.com has a store brand chart. Any competent gunsmith should be able to repair it or point you in the right direction
Mossberg
Marlin
No
I have a Revelation 2500D and it is very clearly a Savage manufactured rifle. Identical to Savages of same period except for the rollmark.
100-300 USD
Up to 100 USD
Mossberg
Ask a gunsmith for help
Please check your model number and repost. That is not listed as a Revelation rifle model, but it IS the model number of a 4 power telescope sold by Western Auto.