If this is the Nieuport 28 I'm thinking of, it's normally got the Gnome Monosupape 9N 150 h.p. rotary which is a raspy, prodigious white noise generator. The men who flew these things had iron gonads to stand more than 2 hours in the cockpit with something making over 130 decibels of racket up front. I bet they missed their SPAD 7s.
And the Neiuport 28 had Vickers MG, when they were available....
Actually then new AEF had to wait or borrow guns for their first flights in their Nieuport 28s. Imagine doing front patrols in a plane that had a habit of shedding it's upper wing canvas in a dive with no weaponry.