Webley hawk Mk 1

Hi there,
Am new here but have no reason to doubt the calibre of the information to be found on specific owners club sites.
Have an AA S400 myself..

My father has a mk 1 webley hawk currently in .22 and is looking to find a .177 barrel to complete the set up, he also has the original webley scope which we think is pretty knacked as shoots like a shot gun when using the scope, and much less so when using open sites.

All suggestions as to where to get said barrel welcome.

Cheers
Paul

Chambers or John Knibbs maybe ?