The Mondragón rifle is a Mexican semi-automatic rifle introduced in 1908, and was based on two earlier straight-pull bolt-action rifles. Manufactured by SIG of Switzerland, the weapon equipped both the Mexican and Imperial German armies. In the service of the latter, the Germans found reliability to be a concern in the muddy terrain encountered by the Infantry, and so it was instead issued to the Flying Corps, where it was used by air crews until sufficient numbers of machine guns equipped with synchronization gear was available.