A Cabelas Alaskan Guide scope may use the same aluminum tube assembly as say a Nikon Monarch, though the lenses may be sourced from a lesser grade Nikon ProStaff. It may have an erector assembly thats the same as a Bushnell Trophy if it's compatible with that 1 inch tube. A power ring like Sightron uses, again if it's compatible with the assembly, ect,ect,ect,.
Lets say we could get 100 guy's together here pitch in $100.00 each and contact various Chinese optics factories and ask to see samples of there various 3-9x40 model scopes. We pick a model from Chang Wang Optics and tell them we would like this model but, with target syle turrets in 1/8" moa adjustments instead of 1/4" coin slot adjustments and a lighted mil-dot reticle instead of a duplex. We would like it roll marked (Joe Blows Super Varmint Whacker) They respond they can build this for us and 500 so marked scopes would cost $20.00 USD each. There you go when your crate arrives in 9 months or so you have your Joe Blow scopes. It sure looks like that BSA model but, the BSA model does'nt 1/8" target turrets and that lighted mil-dot reticle.
Of course there is no Joe Blow Optics factory we just sourced a scope to our spec's just like everyone else does.