Rendering 1st person weapon with a differen FOV

I found a card in the ue4 roadmap which says that the possibility to render a 1st person wepoan with a different FOV has been implemented in 4.9. Unfortunately I couldn’t find any documentation or hints on how to do this. Any ideas?

Here’s the trello card

I haven’t implemented this yet, but it looks like this is the way to do it:

I will post more once I’ve implemented it.

Same problem here idk how use that.

I didn’t manage to implement it with blueprint. Any suggestions are welcome.