The Calzada Bayo CB-57 was a Spanish battle rifle prototype design chambered in the 7.62×51mm NATO round. Three variants were designed in different calibers for the Spanish military, but they were never adopted and very few were built.
The Calzada Bayo CB-57 was a Spanish battle rifle prototype design chambered in the 7.62×51mm NATO round. Three variants were designed in different calibers for the Spanish military, but they were never adopted and very few were built.
Source: Wikipedia "Calzada Bayo CB-57" · CC BY-SA 4.0
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