I just went by clicking the link in your post. It still goes to the gun search page and pre fills the Ruger brand and won't show any other brands. Maybe I got a stuck cookie. Or something.
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The problem with the Davidson's site that I found, was if I clicked on the link at Ruger's website, it will only let me shop for Rugers
If I go there on my own, or from a search engine, it allows me to browse all.