How does an incorrect length spear affect the accuracy of a standard gun?

The spear in a standard gun is only supported in the mechanism and in the muzzle. To see this visually, try setting a long spear up on a table, lying it flat, and supporting it at both mechanism end and barb end with a matchbox. Now look along the spear, basically sighting along it from the mechanism end.

You will see a prominent sag in the middle. The amount of sag you see will depend on the length, diameter and the stiffness/ tensile strength of the spear. If you move the matchbox at the barb end back towards the other box, the spear sag in the middle will decrease.

At a point where the length of spear ahead of the moving box in roughly 1/3 of the total, the sag in the middle will be approximately equal to the now sagging end piece. This is again only really a factor with long spears. More.

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