If you happen to live in the USA, not at all. F.i. Numrich Gunparts offers them, labeled as "Dutch Hembrug Clips". Remember, Romanian, Dutch and Portuguese Mannlicher en bloc clips are all interchangeable. But Numrich and other American companies don't export any more. Even before I bought that carbine, I bought some 100 Portuguese military fmj rounds dated 1930 in clips = 20 rusty clips, some more at gunshows. I needed them for my G.Gibbs Mannlicher too.