The ammunition may be made quite easily, starting with .303 casings and a 6.5x55 die set.
The special CLIPS for the Magazine are VERY hard to find.
This is a SUPERB rarity, wonderful condition!
Holland adopted the Mannlicher turnbolt system in 1895, purchased the first rifles from the Oesterreichische Waffenfabriksgesellschaft Steyr (just try saying that with your mouth full!) and then took a licence to make their own at the Royal Arsenal at Hembrug. Holland was neutral in the Great War, but these rifles did go through some bitter fighting in 1940 and are very rare today in ANY configuration. This is, of course, one of the rarest.