Hello "Flugzeug", welcom to the forum.
I have several RAD hewers, have owned quite a lot more and have seen a large number of them. I have never noticed one with artificial stag grips.
BUT NEVER SAY NEVER IN OUR HOBBY.
It should be prooved carfully. Also sometimes real stag grips looks somehow artificial. And what kind of "artificial" do mean? "Plastic" or wood or...???
Can you show us pics of the hewer in question? This would help a lot.

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.