Hi Shaun
it's a nice one but it's not a rifle grenade, it's a small (65mm) mortar grenade. The throw lenght was 350-840 meters.
The mortar was made in only 100 pieces during 1915, so the grenade is quite rare to find.
There were 2 differents grenades, one explosive and one illuminating.
The explosive one (as yours) has a specific fuze, and a mod 85/99 igniter, so the one in your grenade is uncorrect, it looks me a 79/99. I've seen also a different igniter, i think mod 15 with more sensivity for reduce unexploded grenades.
The illuminating one is longer and with a wood plug, and it's very very rare and very very expensive to buy (when you have the luck to find one)
davide
