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In order to counter the view held by some that the '87 is not "cowboy", I'd like to direct y'alls attention to page 210 of "The Expressmen". (Time-Life Books, The Old West).
It depicts a Wells Fargo express wagon rolling out of the Homestake Mine, South Dakota in 1890.
Two of the four express messengers on the wagon hold 1887 shotguns at the ready.
That is cowboy enough for me.
(Now, with a bit of luck the undersigned might even be able to post a copy of said photo, for y'alls viewing pleasure...?)