Odd rifle amongst the Ross'...

[browningautorifle]

Here's a pic quoted as "8Pl, B Coy 49th CEF(Loyal Eddies). See them all holding their Ross rifles but this individual third from right seated has an odd looking rifle. There's another along the seated row at left and in the big picture is yet another at the second from far left(not included here. Here's a couple pics to help identify. Possible a .22 training rifle?