I already have an additional rider policy for my guns.
My sister had a fire that ended up destroying her husbands guns. He lost a Marlin 30-30 and a Mossberg 500 12ga. They encouraged me to do an insurance audit.
I was very surprised to discover that firearms were covered specifically to only $2500. I needed way more than that. I called my insurance provider and got a rider. While talking with them on the phone they also encouraged me to take photos of each gun and record the serial numbers and store it all in a safe deposit box. All good advice.
--Don't forget to keep a list of ammo and accessories. It adds up!