This is a truism.As long as you have your firearms insured through a different party. Most HO policies have very low limits on firearms/jewelry of about $2500.
And best not to let insurance companies know if you are doing business with any of their brethren. I have a regular auto insurance policy for daily drivers, and I have another, separate policy with a different company for a collectible vehicle. Neither know of my relationship with the other. Yes, they are all connected up by computer when it comes to claims. But major insurance companies can get pissy if they find out you vectored off and covered an antique/collectible car with a specialty company. The majors want ALL your business. If you have an umbrella policy with one or the other, they can compel you by way of rate manipulation to bring all of your insurance biz under same. I don't tell insurance people anything more than they ask directly.