Initially, the Nieuport 17 retained the above wing mounted Lewis gun of the "11", but in
French service this was soon replaced by a synchronised Vickers gun. In the
Royal Flying Corps, the wing mounted Lewis was usually retained, by now on the improved Foster mounting, a curved metal rail which allowed the pilot to bring the gun down in order to change drums or clear jams. A few individual aircraft were fitted with both guns - but in practice this reduced performance unacceptably, and a single machine gun remained standard.
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