You guessed it. There are
more.
That particular version of the quote is referred to as a post Civil
War slogan, which is, I guess, understandable. Colt died before the Civil
War, and some claim that he called his revolver the "equalizer". Another
version, perhaps from earlier, though I tend to trust the Lincoln one as
the most accurate reads:
God made men, but Sam Colt made them equal.
A modern version, from an essay by Linda Hasselstrom entitled "A Peaceful
Woman Explains Why She Carries a Gun" reads:
God made men and women, but Sam Colt made them
equal.
Interestingly, the page on which Hasselstrom writes this (p. 636) shows
up a few times on the web, but someone forgot to write the name of the
book. Nobody seems to have noted that this is a paraphrase of a saying
of about 150 years earlier.