I have a pair of the new stainless 5 1/2s too, but they are fixed sight for shootin' CAS. I would hate to have to shoot C&B in the modern class against all those BHs.
I also have a pair of blue 7 1/2" ROAs too and if I was going to use a C&B for hunting of something, the 7 1/2 is way more accurate.