I am seeing Russian and Polish and I think Egyptian Lower Laminated Wood AKM Handguards WITHOUT The Metal end Piece on the Back of the Lower Handguard. Knowing that the Chinese used them, I am wondering why are they not on the back of some Laminated AKM Wood Lowers? Did all Soviet Block AKM's drop the Metal Back Piece on the Lowers? Did only the Chinese and East Germans keep it? Refering to AKM Wood Lowers only!