When are people going to learn that signing a petition is the second least effective way of getting anything to happen? (The least effective is doing nothing but wishing & hoping.) Basically signing a petition says "Yeah, I agree with/support what this says but have no interest or intention of doing anything else to help make it happen."
Write, email, call, visit your elected representative. Make an appointment to meet with them to discuss the issue. Have your facts ready (notes are great - especially if you have them printed out and somewhat organized so you can give them a copy). Read the laws of your state to get an idea of how they are worded and come with a draft of the law you would like to see passed that will do what you want done - i this case my guess is repealing Section __ of statute __.
If you have a gun rights organization in your state, contact them and discuss what you want and ask what they are currently doing to make it happen or why they are not doing anything about it. Offer your draft legislation to them so they can present it to some supportive legislator to have it introduced.
Then you can start writing letters to the editor supporting the idea. And remember, you do not need to convince those who are already on your side and your chances of changing the minds of those against you is very small. You want to convince the 1% - 3% who are undecided.
stay safe.