That is the tab which stops the butt of the underfolder stock from hitting the lower hand guard. Instead, only the tab will make contact with the wood. This is the reason why almost every Yugo wood lower has a large mark/dent where it makes contact. I like to cut of the tip of thick plastic charging handle covers and stick them on there to keep it from marring up the wood.
Originally Posted By Serb:
Instead, only the tab will make contact with the wood. This is the reason why almost every Yugo wood lower has a large mark/dent where it makes contact.
Yup, when you see that mark/indent, it's a dead giveaway that lower handguard has been on an underfolder at some point.
