[rsilvers]

It is annoying for a trademark holder to see people using their trademark as a search term for a competing product - but he is not correct to say you have to stop if all you did was say it was compatible.

I once noticed an iPod app had in its description "If you like any of these apps, you will like this one too." It went on to list the top 10 apps. Clearly they only did that so that their app would show up in searches for the top 10. I found it exceedingly obnoxious because it was not related at all - and if I were Apple, I would make this search-engine gaming against the terms of service and delete their app. That is the extreme case. You did not do that, as your rifle was genuinely compatible and it was helpful you mentioned it as such.