1. An apparatus for forming a wire for use in a wire gun comprising, means for twisting a flattened steel wire to an amount above its elastic limit, means including a heater for removing the torsional stress from said wire without untwisting it, means for applying to said wire a torsional stress below its elastic limit and substantially reflattening the wire, and means for winding the flattened wire into a coil with the inner end of the coil secured against becoming unwound, said means for reflattening the wire including pairs of rolls between which untwisting of the wire is accomplished, said pairs being positioned intermediate said winding means and a reel on which the stress removed twisted wire is wound.