L.E. Wilson CG-3ACC AAC Blackout Case Gage L.E. Wilson Inc. a family owned and operated business since 1927. And the first to produce the Case Gage in 1935 The "Wilson Case Gage" A one piece gage that will check overall length and indicate min/max case length Measures min/max Headspace. Does not measure body diameters This gage is intended to be used with fired cases to determine a basis for full length sizing and case trimming Made in the U.S.A