I knew the low rings would work with the 50mm obj and the 0MOA EGW base, but I was not sure if they would work with the 56mm obj and the cant from the 20MOA Ken Farrel base. Looks like there would be plenty of clearance for the bell with lows but maybe not for the mag ring (or at least is would be very tight). I'm thinking about picking up some NF UL Low rings just to have and try.
I also just ordered a Karsten cheek rest. As it is I can not get a good cheek weld with the height of the exit pupil. Not sure the low rings by them self would take care of it, they are only 0.115" lower.
Many of the 110FCP's came from Savage with 0MOA EGW aluminum bases, you just have to measure it to know for sure (i.e. if its the same thickness front and rear its not an incline base). The problem with ordering a base for the 110BA and 110FCP is they use #8-40 screws and not the standard #6 screws. You have to special order the base for the larger screws, but they can be found.
As listed in my Sig, Im using the Seekins Precision
"Sling Rail", made for the HS Stock's 2" sling stud spacing. Fits very nicely, and it includes a sling swivel boss in the front of the rail. The only thing, Seekins included some screws to go with the rail but they are not the correct thread for whats tapped in the aluminum rail bedded in the HS stock. I found 1" stainless #10-32 cap screws from Fastenal do the trick nicely (PM me if you need some I had to get a bag of 100).