barrel setback for 22lr

[gunman1]

im looking for any information on how to set ruger10/22semi lr back any detaied information ore a sight would be appreciaped thanks in advance gunman1

 

[SooStan]

Maybe rimfirecentral.com or rimfiretactical.com.

 

[treeman]

use exsisting barrel stub as a blueprint

 

[Preacher]

You'll need to cut a new notch for the holddown if you set it back very much.
What happened that it needs set back ?