Not sure Bill? The picture is a very low-resolution picture and I honestly have no earthly idea?
Really outside of what I study, my files on French small arms are minimal, - I like the French Army of both World Wars (French politics were always another story though- France hasn't had good political leadership ever) but their small arms were butt ugly (imo).
I do have a neat little article from 1917 regarding the French instructing the AEF on the use of grenades, and it shows a few pics of French soldiers demonstrating the throwing of grenades and outlining their doctrine. But although the use of grenade rifles is outlined, doctrine mostly, no pictures of their equipment are shown.
I also have half a dozen images of improvised French grenade tossing devices (early war pics)- from the weird and primitive to the "looking more dangerous to the thrower than the target".
Anyway, nothing like this rifle variation?
BTW, Bruce Canfield's Gun Report article on the V-B (Viven & Bessiere) grenade is revealing in that it says the adoption of the AEF of the V-B was in July 1917, a couple months before the article I referred to above was written. So I assume the above article is about the V-B grenade? (not something like in Wolfgang's picture). Canfield doesn't say when the V-B was designed but I assume in 1916, as grenade rifles were used by the French at Verdun (according to the May 1917 article)