Evolution Gun Works Mainspring Housing, 25 LPI Undrilled, Kimber, Colt, 1911s, Steel, Blued Carbon Finish, Blue, 11411

The checkering on this mainspring housing helps get the weight in the right place and gives you good traction.Pins and springs do not come with this part. You can use the pins and springs from your original mainspring housing or purchase new parts from us.