The Knoxx collapsable stock works well with ghost ring sights, if you get the Power Pack also. The stock works as advertised to reduce felt recoil (I have one on an 870), but using anything other than the bead sights requires one to lift their head off the stock tube and consequently get a little slap in the cheek. The Power Pack comes with a low cheek rest for use with bead and ghost ring sights, and a high rest for red dot scopes, etc. I have a red dot on my 870 with the high cheek rest, and it works great. It also has a shell holder for 5 rounds, and a nifty little compartment for extra batteries, ear plugs, etc.
Hope this helps
Blubacon50
