The light rifle has the exact same magnetism as the BR.
I don't have a good video for the light rifle, but you can easily prove that it is hitscan by starting up a splitscreen game and trying to shoot someone with it all the way across Ragnarok. It hits just as fast as the BR or DMR. It is hitscan.
Where are you guys getting the idea that it isn't hitscan?
Perfection. Where everyone fails. If you expect nothing you can be happy for everything.