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The existing barrel can easily be shortened with a carpenter's square, a hacksaw & a file.
(The legal Federal minimum length is 18", measured via dropping a rod downbore against the face of the closed bolt)
If the long barrel has a vent rib, cut it just forward of the nearest rib support that's locacted 18" or more from the bolt face.
DON'T do a mathmatical deduction, subtracting from the existing barrel length, or you could get into an irreversable error.
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