Although the Wikipedia article was full of technical details about the weapon, it did not mention mass shootings where the gun had been used – nor the controversy surrounding its availability.
This was not an accident. An expert group of special interest editors, which are common on the open encyclopaedia, have been working under the name “Wikipedia Project: Firearms” to demote content regarding gun control.
The bias in the articles was not explicit, but structural. The project did not insert false information into the articles, but instead purged information that showed the weapons in a bad light – dismissing it as “off topic”.