probably a 16 mm barrel swivel on the not sure tho, never had one myself
as for the scope mate, I don't know, it was mounted on the used 97k I bought last night.
its in the shooting supplies box right now tho.
I might put the hawke sport from the 77 onto the 97
and then either iron sights or the hawke airmax on the hw77.
or sell the airmax, but not sure yet, want to try it out first seems a nice little scope.
as for the Sandwell tune, you would be best ringing and asking about the work they do and prices over the phone,
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what did you end up gettin