Gaucho's "Hints on Trapshooting"
 

Forest & Stream Sept. 6, 1902
https://books.google.com/books?id=9kMhAQAAMAAJ&pg=PA200

Parker Gun Club shoot, Sept. 1&2, 1902
https://books.google.com/books?id=9kMhAQAAMAAJ&pg=PA219

Gaucho's "Northern Rambles"
https://books.google.com/books?id=9kMhAQAAMAAJ&pg=PA478

Is this the same "Gaucho" who was Nash Buckingham's neighbor as a child and had Gladstone as one of his dogs?

Gaucho is renowned Parker salesman A. W. DuBray.

And accomplished Pigeon shooter
https://books.google.com/books?id=QE...J&pg=PA100&lpg

Ed Muderlak's Parker Brothers: Knight of the Trigger: a Fact-based Historical Novel Describing the Life and Times of Captain Arthur William Du Bray, 1848-1928 is still available
https://books.google.com/books/about...d=msgMAQAACAAJ

and BTW, it appears that the Professional Representatives toured together

In 1899, McMurchy likely traveled through the West with both Col. A.G. Courtney (Remington) and S.A. Tucker (Parker)
Harvey McMurchy and Col. A.G. Courtney (Remington Arms), two popular gun salesmen, attended a holiday shoot at Kansas city Feb. 22. In a live-bird sweep each killed 14 out of 15. Both did well in the target events.

H. McMurchy, of the Hunter Arms Co., and S.A. Tucker, of Parker Bros., are now in San Francisco working the trade in the interests of their respective firms. They took part in the club shoot of the Olympic Gun Club on March 12; McMurchy killing 12 straight and Tucker 10 out of 12. In a six-bird sweep McMurchy again made a clean score.

Sorry my mistake. W A Wheatley used the name Guido in his writtings not Gaucho.