"armalite" auto completes and even helpfully suggest the AR15, the exact weapon used in all the most spectacular massacres.
I'm not suggesting Google interfere with either. I'm suggesting copyright forces have an unreasonable amount of clout, much of it invisible. More even than a mass movement against school massacres.
Try searching for "shopping" results for "ar15", "armalite 15", and "ak47". It will show they have explicitly filtered out "ar15" shopping search results