Collect insure is who I'm with now, as I went with another company on my home from what I had and while their homeowners policy was cheaper, they were just silly on the cost of the rider.
There are some caveats but they seem to be the best route, especially for the price. The main caveat is that they only insure "COLLECTABLES". So your firearms are going to be covered, but reloading equipment, components, belts, holsters, etc. aren't. I'm hoping my homeowners will cover that stuff. Luckily I haven't had to file a claim.