Besides the fit of the barrels to the frame and the need to be a very close-tolerance fit - which is key to preventing premature wear and the resultant 'wiggle' - is the correct and equally close-tolerance fit of the doll's head extension. Not simply as a mechanical thing but for the proper aesthetic appearance. A doll's head that fits improperly is usually a dead giveaway that the barrels or the doll's head may have come from another gun. We have all seen them... doll's heads with .015" or as much as .030" or more gap between it and the recess it fits into.
Below is a doll's head illustrating a perfect factory fit.
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