Assuming it is a sporter barrel? I dont think any newer varmint barrels were drilled for sights, but the older ones were.
Is it a shiny blue, or more of a matte black?
If it is a shiny blued sporter, it is probably a 22"(measured to the end of the threads where it screws into the action) off a model 11, 12, or 14.
If it is a matte black varmint contour it should be off a model 10fp, although I dont think these were tapped for sights.
If it is a blued varmint it could be a model 12fv, although they are usually 26" long. It could also be an older model 110 barrel that was threaded for sights, but was usually 26" long also.
In any event I'm pretty sure it should be a 10 twist.
Hope this helps.
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