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Don't carry a loaded firearm
Don't carry a loaded firearm? That's a "loaded" statement. As the late Paul Harvey would say "and now the REST of the story."
What do you consider a loaded firearm? Well the correct answer is a firearm with ANY ammunition in it. Does that mean with a semi-automatic pistol with a loaded magazine inserted but without a cartridge in the chamber that it is loaded? In my line of work you bet your sweet rear end it is. A person once said "An unloaded gun never hurt anyone!" That may be true but aren't we suppose to treat all firearms if they are loaded? Okay I have made my point so lets move on.
If you enter ANY establishment and draw a loaded firearm for any reason then expect to be at the very least chastised for it. If you are looking for a new holster, don't bring in a loaded gun. If you are looking for a holster and you are carrying the firearm you need the holster for DO NOT DRAW IT. There is absolutely NO excuse to ever draw a loaded firearm especially in a gun store. It doesn't matter how many years of experience you have doing anything firearm related you never break this rule. I have been smithing for well over 30 years now and even I know that mistakes happen. The minute you stop respecting your firearm is the minute you become a danger to yourself and the rest of society.