This buttstock came on the MAK90 that I purchased. I have been told that it is just a modified thumbhole stock. I can not find one like mine ANYWHERE so I believe it. I need a new one because this one is cracked. My only doubt is that I purchased this firearm from someone who knows very little (even less than me) about guns. I have examined it closely and I do not see one single sing of where any modifications have been made. The wood is all smooth and glossy as if it was made this way. What do you all think? Someone apparently put a good bit of work into this if it is a modified thumbhole. I just wanted all of your opinions before I purchased a thumbhole buttstock and tried to replicate it. My original: Thanks in advance my friends.