The two rifles are very similar except for caliber and barrel length ( the 7mm barrel is a hair longer). The converted rifles typically have the caliber 7.62 marked on them. The Guardia Civil rifles, marked with the crest of crossed sword and fasces, apparently were converted to 7.62 from both 19 rifles in the 1960’s. Original 1916 short rifles were in 7mm Mauser ( 7x57). According to sources, these rifles were made by the Ovideo arsenal between 19. Using the model 1893 rifles, Spain developed the Spanish Civil Guard, M1916 Short Rifle, a rifle that changed a 29 inch long barrel to 21 inches. Adobe PDF Downloadable Version of Article