I am looking into options for a low scope mount that would be useable on a riser. The riser in question would be a Vltor CASV rail and a similar height riser on other uppers.

-I see ARMS makes a low QD set but are they repetable?
-Leupold has their QRP I think it is and my non QD version of that ring has served me well. Then again how repetable is the QD version and how QD is it really?
-Who else makes some good options?
-What are some good risers to use? Im looking into the ARMS #38 EX swan sleeve now that they use the 40L sight.

Thanks for any help.