The Russian Expeditionary Force landed in Marseilles, France carrying their M1891 Mosin Nagant infantry rifles, though they were later issued French rifles, and can be seen armed with an assortment of Berthiers and Lebels in photographs.
3-Line Infantry Rifle Model 1891
Legion Russe members are instructed to carry a M1891 3-line infantry rifle (M91/30's are okay for new recruits, but must upgrade to a correct rifle as soon as possible!).
Required Weapons Items:
Втнтовки - Rifles
Model 1891 Винтовка Мосина 'vintovka mosina' (Mosin Rifle)
Wikipedia article
-or-
Models 1907/1915 or 1916 Berthier
Wikipedia article
-or-
Model 1886 'Lebel'
Wikipedia article
Imperial Russian Rifle cleaning Oil Bottle
Гренаты - Grenades
French F1 1916 smoke/gas grenade.
French F1 fragmentation grenade.
Wikipedia article
These can be replicated out of lightweight materials such as injection foam, and painted to resemble the real thing. A .5 inch diameter bore in the top will accommodate a small 30 grain powder charge with a three inch fuse. Would you like to know more?
Optional Weapons Items:
Револьвер - Revolver
Model 1895 Nagant pistol 7.62x38R
This weapon should only be carried holstered by the company Feldfebel (Sgt. Major). It is however authorized for close-quarters fighting for during night-time trench patrols and raids, but it must be kept in the soldier's kit or in his pocket and otherwise out of sight.