You are mistaken. What you might be thinking of is that each firearm purchased must also have a lock (purchased within 30 days) or you give them make and model of your safe. Locks cost $7 and even then you just need one, and then sell it to a friend for $1, buy it back from your friend for $1 and write a bill of sale with the date on it. Perfectly 100% legal.
Or else, you are liable if you keep guns unlocked in your home and a kid takes the gun and does something stupid with it.







