I think, it was most difficult model of gun i've ever done. This is a compact version of Soviet MTs 20-01 hunting shotgun.
It features a metal stock that folds underneath the weapon in order to make it more compact, and a pistol grip. The rest of the stock is wooden. This shotgun was officially marketed as a hunting shotgun, but became popular among farmers, truck drivers and other people who needed a self-defense weapon for use in the countryside or wilderness. It received a lukewarm welcome among hunters, though it is somewhat popular for finishing wounded game.