Springfield XD ATS Sight:

Designed for speed, precision, and clarity of sight picture, our one-sight-fits-all XD and XDm sight kit includes:

• 5 differently colored front sights
• 5 differently colored rear sight inserts
• .044" of elevation shim
  (pink = .015", clear = .008", tan = .004", red = .002")
• Front and rear sight set screw hex keys

With the XD and XDm start with .015" of shim. Amount of needed shim will vary, depending on load and particular barrel. Approximately, each increment of .002" to .0025"of elevation shim will affect bullet impact by 1" at 25 yards. The XD and XDm front sight base is a press fit and may need to be professionally installed.