The problem wasn't their name but rather how Wikia works, we can only have a global "article name" for each weapon, otherwise the database will be cluttered with tons of redirects. Now, I'm well aware that those rifles have "rifle" and "knife" form, but on a more confusing note, they can also use melee attack on their rifle form, so the "knife" on their name reflects that and not the transformed form.
We'll discuss this further among the admins and see if we can come up with a better naming solution
These weapons can't use melee attack on their Rifle mode, they changed that to the "Press 1".
That way you can only use the Knife Mode when the weapon is transformed, when the weapon is in Rifle Mode there is no melee attack... They changed from RMB because the Knife Mode now has Slash and Stab attacks (RMB and LMB).
So now the name Red Knife Beast doesn't make sense anymore, since the Knife is basically another weapon...
Sorry if I'm bothering you, I just wanted to let you know :/ sorry Ron.
(These only affect the Red Beast set, the others remain the same (M4A1-S Rifle Knife and AK47-S Rifle Knife)).