Is this knife for real or ever really used?

Has anyone ever seen this knife before and can it really be used on a bayonet? It is said that it can fit together with a AK47 rifle. Maybe it is a copy of some old military knife that was used back in one of the wars? The website that it is on is [link deleted] I am wondering if it can fit on any other types of guns or rifles. Does it look like something that would be used by Chinese, Koreans, or Russians. Here is a link to the knives page [link deleted] and it is the knife with the number 406023 right at the top of the page.
Any help would be appreciated before I order it all the way from China

I have deleted the links you offered, as advertising is not allowed within the forums.
As you have asked a question, as opposed to outright spamming, I will give you the benefit of the doubt for now, and say it is perfectly possible that bayonette attachments have been developed for modern automatic rifles, but a Martial arts website is not the best place to ask about them- you would be better going to a website dedicated to firearms.