A quick note, after "haunting" this forum for quite some time & gleaning the wisdom of members here I finally registered! I have a question for the wise men regarding a S&W 66-3 with 2.5" barrel, Serial # BNA17XX, this regarding the rear sight blade height. S&W tells me it is .106 but everything I've read on these older models states that the 2.5", 4" and 6" Mod 66 all take the .146 height blade. Any suggestions and opinions would be greatly appreciated. Thank You