I only have four Colts that's aren't .45s, and all have numbers; "2" for .22, "3" for 9/.38, and "4" for .40/10; .45 may not be numbered.
I'll admit to no longer having any Springfields.
EDIT: This is from another forum:
Slide Stop Lug Dimensions
Unmarked: length .197; Standard .45
Number 1: length .197; Caliber .45
Number 2: length .205-.210; ACE, Conversion Unit, .38 AMU & .38 NM
Number 3: length .215-.220; Super .38 / .38 Super Auto
Number 4: length
M: length .197; Match
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Runs off at the mouth about anything 1911 related on this site and half the time is flat out wrong.
Last edited by RickB; June 4, 2020 at 08:49 PM.
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