"...bolt that came with the rifle is shot..." What makes you think that?
It's unlikely that higher rings would help. If that were the case that's what would have been done with the A4's.
Anyway, Gunparts lists '03 bolts with the handle modified for scope use for $28. A blued one will be $29.25 and a complete bolt runs $85.50. All bolts must be fitted for headspace though. They are not drop in parts. And whatever "comparative headspace" is won't matter.
I do seem to recall seeing just bent bolt handles on-line though. It was a cut and weld thing, I think.
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