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The Astra Model 400 is a semi-automatic pistol manufactured by Astra-Unceta of Spain. It was chambered in 9mm Largo and used a delayed blowback action with a unique rotating barrel system. The pistol was famously capable of firing both 9mm Largo and 9x19mm Parabellum ammunition without modification. It served as the standard sidearm of the Spanish military from 1921 through the 1960s. The Astra 400 is known for its simple design and the ease with which it can be field stripped.
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