Curious, what makes that not safe for work? It's a discussion about a handgun manufacturing error, and the manufacturer's failure to respond adequately to it.
They might have very zealous web filters. Something like Websense would categorize that site as "Weapons" related and visiting the site, even if not blocked, would result in a scoring change to the user's profile.
I don't blame them for playing it safe. I've personally had to help Bay Area HR types understand that looking at "weapons" sites by itself was probably okay when the company we worked for had thousands of employees across California and at least some percentage of them hunted, went target shooting, etc.
Weapons are for hunting, target shooting and killing people.
These HR types (and many in the general population) need to understand that there's nothing wrong with the third point. Aside from the obvious case of self defense, people can only protect their freedom as long as they have equally powerful tools a those trying to oppress them.
Democracy can only work with the ability to kill evenly distributed.
There's a reason all dictatorships have strict gun control laws.
