I would say first that it is 'store policy' not to be able to field strip a firearm in the store
I dont buy from any store that balks at a quick field strip. Period.
Their either selling used guns as new, simply stupid and worry about breaking them, or are commonly mis-representing thier stuff in other ways.
A really good gunstore offers to field strip the NIB fresh one from the back...
Theres a couple of them here in STL