Word on this spread pretty fast amongst the peoples... Google is shooting down any gun related results on their 'Google Shopping' search engine.
Look... Google has ALWAYS rigged the results we get when we use that free search engine thing, no matter if it's 'shopping' or the regular Google. Relying on them for an honest search engine is just silly. They've never made any claim to be honest in the search results, and expecting them to be is rather childish.
Perhaps that is why I've never found their 'Shopping' search engine to be of the slightest use, and simply don't bother with it. In fact, I've lately been exploring the use of other search engines besides Google... period. Their are plenty to choose from, once you get past the knee-jerk 'Google It' reflex we've allowed ourselves to accept.