“B-10U handguard” rail is a milled product made of D16T aluminum alloy. It is installed in the place of the regular handguard of AK-103, -104, -105, -74M, -74S, AKMS, AKM, Saiga-MK v.30, Saiga-MK v.33, Saiga-MK 223 Rem. v.03, TG2, Vepr-K, Vepr-KM, VPO-209, AK-366-Lancaster. “B-10U handguard” rail forms a Picatinny rail on the bottom and two Basis rails on sides. Also it forms one additional Basis rail in the rear part on the bottom. Basis rail allows to install additional accessories directly on handguard.