CC-FT's and SGT's models both have 5 inch blade, Pappy, not 5 1/2". The SGT is quite a bit beefier. Any of the suggestions will work just fine.
The last Randall the RKCA made was a Sergeants Model for a Sergeant and he looked pretty satisfied with it to me. He was already retired and Sgt Sinclair looks to be far from it.
Consider evrything ya'll think might serve him best...Keep it up.
Thanks, Capt. Chris
PS: I just emailed Rick T. the introductory page for the RKCA to be used on the new website and forum banner, etc...CCS