I've never heard of post civil war units being armed with them.
During the Northfield bank robbery of 1876, a university student named Henry Wheeler happened to be in town and was armed with a Smith carbine when the gunplay began in the street. Wheeler was in a 2nd floor hotel room. He saw Jim Cummins, one of the robbers, trying to make a run for it after he or one of his fellows shot Nicholas Gustavson dead. Wheeler took aim from the window at Cummins, now a fast moving target galloping down the street, his first shot shattering Cummins' right shoulder and effectively disabled him from using his six-shooters.
Wheeler then spotted Bob Younger hiding behind a staircase trading gunfire with the townsmen that have now gathered. Only able to see Younger's arm behind the cover, Wheeler's second shot blew Younger's arm clean off. That is what a 350 grain lead flatpoint traveling at just under 1000fps does to human appendages, the robbers probably realized, too late of course. For all their trouble, guess what the James gang netted in the robbery...
Just $26.70, thats it, and of course, a death bounty placed on all of their heads. Not even Mastercard can beat this priceless deal, can they?