The Model 1917 and Model 1919 are, for all practical purposes, identical, except for the water jacket. Very little lightening was practical or was done for the M1919 and it was intended for use on a tripod. The M1919A6 was designed as a "light" machinegun, but anyone who ever carried one knows that the term "light" is a joke. I think that steel butt alone weighed more than a modern LMG.
Jim
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