The NRA firearms museum is reason enough to visit. I visited a few years ago and was awed by their collection.
I have been to the NRA museum three times. Each time was more awesome than the last. They assured me that between what was in their vaults and in visiting collections, that what I saw in the displays was only the tip of the iceberg.
Wonder why there haven’t been more nutbag demonstrators at the museum, lately. I read that the grounds were designed to interfere with protests and make dispersal easier for police.