I think PM is just sick and tired of the anti-gun letters they get whenever they run a gun article and sometimes just an advertisement, even though PM's typical gun article is usually pretty PC, like the one in this issue (replica cowboy coach shotguns for crying out loud!)
They get the same kind of crap when they publish their yearly boating issue about showing pretty girls in bathing suits in the pictures of the boats. Balderdash I say! Have you ever seen a cigarette boat that did not have a pretty girl in a bathing suit on it? I have not. Why else do ya think those rich guys buy them long noisy very expensive boats - to go fishing?
Regardless PM gets a lot of that sort of thing because they have a pretty wide audience, but I do applaud the pre-emptive letter from the editor.