B-11U rail is designed for AKS-74U and rifles based on it.
B-11 rail a Picatinny rail on the bottom that allows to attach additional equipment on weapon: tactical flashlights, lasers, grips, bipods and RK-1 (RK-0, RK-2, RK-4, RK-5, RK-6) grips from "Classic" kit.
B-11U rail forms two Basis rails on sides and one mini Basis rail on bottom that allow installation of following accessories directly on handguard: B-2 (45 mm.), B-2U (75 mm.), B-2L (34 mm.), B-2M (15 mm) side Picatinny rails; A-1L and A-2L slingmounts; RL-1 hand stoppers; NPN-2 Basis rail covers; FP-3 wire holders; tactical switches from "D" line. Bottom mini Basis is especially comfortable with RL-1 hand stopper.

Benefits during operation:

• improves the cooling of the weapon barrel in the area from the receiver to the gas tube;
• makes it possible to attach additional equipment.

Specifications:
Material: aluminum alloy D16T;
Weight: 115 g;
Overall dimensions: (129 x 38 x 41) ± 5 mm;
Operating temperature range: from -50 to +50°С.

In the kit:

Screws M5x7	4 pcs.
Manual	1 pc.