Not quite Spanish though jcorry, barrels are made in Belgium where the gun is regulated, I believe Victor Sarasqueta (the old guy now long dead, not the modern company) and Mateo Mendicute (also long dead) are the only two Spaniards who made a complete double "in-house". Mendicute moved to AYA in 1952, in his 1930's catelogues he lists his double in .303 British, they exist, somewhere, in very limited numbers but I have never seen one, let alone seen one for sale

best, Mike