updates mosin mob sprite (#76325)

code/modules/projectiles/guns/ballistic/automatic.dm

@@ -327,6 +327,10 @@
 	desc = "One of countless obsolete ballistic rifles that still sees use as a cheap deterrent. Uses 10mm ammo and its bulky frame prevents one-hand firing."
 	icon_state = "surplus"
 	inhand_icon_state = "moistnugget"
+	lefthand_file = 'icons/mob/inhands/weapons/64x_guns_left.dmi'
+	righthand_file = 'icons/mob/inhands/weapons/64x_guns_right.dmi'
+	inhand_x_dimension = 64
+	inhand_y_dimension = 64
 	worn_icon_state = null
 	weapon_weight = WEAPON_HEAVY
 	mag_type = /obj/item/ammo_box/magazine/m10mm/rifle

code/modules/projectiles/guns/ballistic/rifle.dm

@@ -3,6 +3,10 @@
 	desc = "Some kind of bolt action rifle. You get the feeling you shouldn't have this."
 	icon = 'icons/obj/weapons/guns/mosinnagant.dmi'
 	icon_state = "moistnugget"
+	lefthand_file = 'icons/mob/inhands/weapons/64x_guns_left.dmi'
+	righthand_file = 'icons/mob/inhands/weapons/64x_guns_right.dmi'
+	inhand_x_dimension = 64
+	inhand_y_dimension = 64
 	w_class = WEIGHT_CLASS_BULKY
 	inhand_icon_state = "moistnugget"
 	worn_icon_state = "moistnugget"
@@ -121,6 +125,10 @@
 	desc = "A weapon favored by carp hunters, but just as infamously employed by agents of the Animal Rights Consortium against human aggressors. Because it's ironic."
 	icon = 'icons/obj/weapons/guns/ballistic.dmi'
 	icon_state = "speargun"
+	lefthand_file = 'icons/mob/inhands/weapons/guns_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/weapons/guns_righthand.dmi'
+	inhand_x_dimension = 32
+	inhand_y_dimension = 32
 	inhand_icon_state = "speargun"
 	worn_icon_state = "speargun"
 	mag_type = /obj/item/ammo_box/magazine/internal/boltaction/harpoon
@@ -256,6 +264,10 @@
 		It is also able to be suppressed....somehow."
 	icon = 'icons/obj/weapons/guns/ballistic.dmi'
 	icon_state = "sniper"
+	lefthand_file = 'icons/mob/inhands/weapons/guns_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/weapons/guns_righthand.dmi'
+	inhand_x_dimension = 32
+	inhand_y_dimension = 32
 	weapon_weight = WEAPON_HEAVY
 	inhand_icon_state = "sniper"
 	worn_icon_state = null