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The barrel to receiver fit is critical for the assembly process. If the
barrel is loose in the receiver, when you tighten the V-block screws it
will cause the barrel to droop so that you will never be able to get
the scope dialed in. We plug gauge the receiver barrel hole in each
receiver before shipping to ensure that its within the correct tolerance. The
barrel manufacturers (including our barrels) also hold their barrel shanks often on the larger
end of the tolerance scale to ensure that its not going to be loose in
any receiver that you may put it in.
When you have a
precision receiver that is holding the hole tolerance and a barrel that
is also trying to compensate and be capable of being used in any
receiver with varying hole diameters, then the barrel can be too tight
for the receiver hole which is a common occurrence. The logic is that
its far better for it to be a little too tight so it can be fitted to
the receiver rather than be too loose.
The fitting of the barrel
to the receiver can be accomplished by any one of multiple methods,
depending on what resources you have available. All material should be
removed from the barrel shank since its much easier to get to it and to keep
round. If you don't need to take much off, you can use sandpaper on the
barrel shank until the shank is a light press fit to the receiver. If
more material is required to be removed, you'll have to use a wide flat
file on the barrel shank as you slowly turn the barrel. Usually you
only have to polish off a few .001's so sandpaper is all that's required
and you'll wind up with a perfect barrel to receiver light press fit.