Browning M1917 was in service for many years after WW1, so I'd guess there might be any number of modifications and different barrel configurations.
Most weapons do eject to the right, both machineguns and rifles as they're designed for right handed people. You'll find most left handed people overcome their wonderful blessing and learn to fire weapons like their right handed colleagues.
The irony is, the only machinegun which I know can be adapted to feed from the right is a Browning, but the later Browning M2 50 cal, and even then, I don't think it's done to suit left handed people, but to fit odd and tight places when fitted into vehicles and aircraft etc, or fitted side by side on a mounting. I'm not sure if it's a field modification the gunner does himself, or whether it takes an armourer to change it over.
Edit BTW, a coaxial machine gun is the term for where you can switch the direction of the feed.
Edited by FlybyPC (06/03/12 02:48 PM)