AR Sight rail?

[twsulli54]

Is there an AR sight rail/mount that you can put two sights on? I'm looking for one that might have a track which allows you to roll the sight you want to center while the other moves to the side and downward out of the way. Eliminating the need to shoot the rifle sideways, enabling you to flip the sight you want to center? Any help would be much appreciated thanks!

Example: an ACOG and a holographic

 

[phylodog]

Rob Pincus had a video a few months back of a forearm rail system which rotated allowing the user to have different accessories mounted and position them at the 12, 3, 6 & 9 o'clock positions as needed. That's the closest thing I've seen and wouldn't work for your needs as the ACOG would be too far forward for proper eye relief and I doubt it is stable enough for mounting aiming devices (too much play in the mechanism).

Haven't seen anything that mounts to the receiver. Your best bet would be good quality return to zero mounts. You could store the optic you weren't using on the forearm rail.