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The ZRTS Ultimate Package includes everything you need to upgrade your GSG or Sig Sauer 1911-22. It comes with a full length guide rod, slide alignment cone (SAC), bushing, spring & plug. This package is designed to improve the performance of your GSG & Sig Sauer 1911-22 pistol.
The Ultimate Package is designed to work without using the barrel screw. This eliminates the problem of changing the point of impact every time you re-torque the barrel screw.