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Fitting a Ruger barrel is trickier than one might think. The reason is the way they are installed in the factory. Ruger makes the barrel, complete with front sight base and feed ramp, all in one piece, and screws it into a piece of threaded tubing. Then, using the feed ramp as a reference point, they machine the ejection port, the magazine opening, and the rest of the receiver.
That is fine, but it does mean the barrel and receiver are mated to each other and require more fitting than the usual barrel-receiver combination.
Jim
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