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Yes, if the left hand side of your BSA action has machining for safety or little flat it most likely was one of those .

I think the express sighted barreled action would of been in its youth one of these ?

http://i.imgur.com/wpkOrtVh.jpg

http://i.imgur.com/nyOi2a7h.jpg

Ok will do, you really need the heavier barrel to, either the MLE/Long Tom or Lithgow H profile !

Here is a nice one by a Aussie gunsmith .

http://i.imgur.com/9GaUHrkh.jpg

The little screw is stop the the lobbing/tangent slider sight from coming off the ladder, there is normally 3 screws, the little one, the screw in the tension spring & one into the barrel but that...

Great project, I have been putting together Lee Speed (BSA Sporters) parts for over 15yrs & if I had found that sight I would of snapped it up, it is off the later lighter barreled, plain stocked ...