Springfield 1911 ATS Sight:

Designed for speed, precision, and clarity of sight picture, our one-sight-fits-all Springfield 1911 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 our Springfield 1911 .45 start with .020" 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 Spingfield 1911 front sight base is a press fit and may need to be professionally installed.