CZ USA 600 Lux Walnut Bolt Action Rifle - 300 Winchester Magnum - 24in - The refined lines and traditional style of the Lux reflect a long, proud tradition of gun makers and hunters. The Lux lives up to the expectations of its lineage, but it is so much more than oil-finished select-grade walnut and steel. The steel receiver is drilled and tapped for Remington 700 pattern bases. The advantage of the Lux goes beyond mere aesthetics; it comes with a sub-MOA guarantee as well. The thread pattern is M15x1.