Why in the world would you want a rifle like this?

CETME A, B, modelo 58, C Assault Rifles (Spain)

Stg.45(M) - German predecessor to CETME rifles, made at the Mauser Werke in 1945

Early CETME assault rifle prototype chambered for experimental 7.92x40mm cartridge

CETME modelo A assault rifle, chambered for 7.62x51mm reduced load cartridge

CETME modelo B / mod. 58 with 30 rounds magazine