Abstract: A method and apparatus for the production of a transversely corrugated or serrated interior pipe of a double walled special gas discharge pipe with high angle selectivity, especially to the production of such pipe from silicate materials, preferably for CO.sub.2 laser with axial gas discharge with high amplification, the method and apparatus providing for the economic production of such pipes from silicate materials, with defined sharp-edged corrugations, in the required accuracy and quality. This is accomplished by forming an interior pipe from a smooth cylindrical glass pipe, which has been heated by means of suitable heat sources, until the material can be plastically formed.