Been a fan of Milton for many years. Better farm stores and hardware stores in rural areas. I try to use all their products, female ends less prone to problems, air chucks many styles. Pressure gauge is a quality item.
But I have some Chinese and other odd things. The Milton blow gun nozzle, that little air squirter that fits in your hand, with a rubber tip? The Milton one has a large rubber end. I also have a smaller one from China with a smaller tip.
Air chucks come is several different shapes and styles. The one I have settled on seems to be the most common around this part of the country. It is style "M". There are others with names like Industrial or professional and other letters of the alphabet. As far as I know everybody else uses M also. Maybe some of the pros and people with more experience than I can straighten me out if I've got this wrong.