What is this rifle?

[Cloud Cover]

This came to me today on Pinterest. Im wondering what type of rifle it is? Cheers.

 

[TheHead]

I did some google fu and it looks like a 20 mm Lahti L-39 anti-tank.

https://en.wikipedia.org/wiki/Lahti_L-39

 

[Cloud Cover]

I think you are right. thanks. The soldier appears to be wearing insignia of Finnish cavalry.