Laser attachment. Whats it do?

Games Halo 5: Guardians
1

I’m assuming it has something to do with bullet magnetism, but I’m not sure.

Does anyone know?

2

According to the Reddit thread it decreases bullet spread.

3

I hope it reduces recoil.

4

Mostly it looks at me with sad faces as I use more useful attachments.

I think it increases magnetism though.