Riders on homeowners cost 4x what Eastern Insurance charges for the same (but probably not the same) coverage. Risk is on a claim they may cancel your homeowners, not always but was warned by my prior company wrt increased computer coverage I had back when I was doing consulting work. Most likely will require a list of what you own, also likely S/Ns as well.
NRA was 2x what Eastern Insurance charges.
Collectibles was next, more expensive than what Eastern Insurance charges (don't recall the delta) AND it would not cover carry guns or any guns you shot more than a couple of times/year. Designed for "displays" and museum type collections that never leave your home. Required a list of what you owned.
Eastern Insurance has no such caveats, covers shipping insurance as well, etc. None of the risks above and no names/model numbers/S/Ns (unless a particular item is extremely valuable, either $5K or 10K is the trip point, don't recall which).
Over time I've used all of the above except a rider on homeowners.
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I'd let Jack Richardson (VP of Eastern Insurance and founder of the insurance plan under discussion) know your displeasure and let him push this uphill as it undermines the business that Jack created for them. If you do so, please do it respectfully as Jack is one of us, a shooter and probably as displeased as we are over what occurred.