They were primarily used by Belgium in .30-06. Other countries that used them were Columbia (.30-06), Argentina (originally 7.65x53 Mauser, then converted to 7.62 Nato (which also added a 20rd detachable magazine) locally), Venezuela (7x57 Mauser), Luxemburg (.30-06), and Egypt (7.92x57 aka 8mm Mauser). There might be a couple other countries I missed but those are the big ones.