I'm picking up a 15 model PB AT this weekend and I'm wanting to add the NV bridge, but I'm wanting to make sure I can run the bridge with a 16.5" barrel and suppressor. Also, from my reading I'm seeing I need the high rail in order to line up with the nv rail, is that correct? The one I'm buying has the low rail installed. Obligatory pic of my hopefully new to me AT.