OP, it wasn't the store's fault. I think they handled it perfectly. Sending it back was a rational reaction.
Where did anybody say the shop sent it back?
That is what the OP was complaining about. That the shop was
willing to send the gun back for factory service. On
their dime, and their time. Something that they are not in any way required, or obliged to do. That's when he went into a tizzy labour being without the gun for two weeks if they sent it back.
Guns
are not TV sets, and warrantee work is done differently.
BTW, please post the name and location of the gun store that allows you to chamber and fire a live round to test it before taking the gun home
That is a ridiculous statement. Of course you won't find a shop where you can load a round in a new gun and fire it. Of course there are several in my area with a range where after you buy a gun you could try it out. They usually give you some free range time when you buy a gun. So, yes there are such shops, but I don't think that was what you meant.
But other shops will let you reckon the slide,in fact
they rack the slide of every semi auto, or open the cylinder of revolvers, work the bolt on rifles etc.
All as standard safety procedures. They do it with every gun, every time it is taken out of the case. They also do it with in box stock from the back room. They open the box, safety check the gun, then make sure the serial number matches the box, and paper work.
That detail was something else missing in the OP's story. Was that procedure done before he took the gun home, took it apart to clean it as should be done with
all new guns, then reassembled it wrong, causing the slide to be locked up.