"B-21M handguard" rail is designed for Vityaz-SN, Saiga-9 and TR9 Paradox.
"B-21M handguard" rail forms three Picatinny rails that allow to attach additional equipment on weapon:

• a tactical flashlight;
• a laser pointer;
• bipods;
• B-9M, B-9AK mounts for flashlights;
• A-1 slingmount;
• NPN-1 Picatinny rail cover;
• RK-1, RK-2, RK-4,RK-0, RK-5 grips;
• FP-1 and FP-2 wire holders;
• B-19 or B-19N upper handguards; 
• B-22 rear sight rail.
  

Operational benefits:

• improves the cooling of the barrel of the weapon in the area from the receiver to the gas tube;
• makes it possible to attach additional equipment;
• when installing a tactical flashlights or lasers on the B-21M rail, the standard weapon base "Dovetail" located on the receiver of the weapon remains free for the installation of optical sighting devices.

Specifications:

Overall dimensions: 165х54х42 mm.
Weight: 172 g.
Material: Aluminum alloy D16T
Working temperature range: From -50 to +50 ˚С 

In the kit:

B-21M handguard	1 pc.
Manual	1 pc.

To install the "B-21M handguard" rail on weapon, you need to:
1. Make an incomplete disassembly of the weapon and remove the regular handguard.
2. Install the "B-21M handguard" instead of the regular handguard. B-21M should be installed very rigidly, for that it is necessary to:
- install the regular handguard retailer on B-21M;
- attach B-21M to the receiver;
- place a wooden or metal spacer on handguard retainer, hammer in B-21M rail into the receiver of the weapon;
- close the lever on handguard retainer.
3. Assemble the rifle.
Attention! Do not file the handguard during installation. This can lead to the formation of a backlash at the junction of the handguard with the receiver.
The hardness of the handguard landing determines the hardness of the landing of the sights, which affects the accuracy of the shot.

The warranty period for the product is 60 months.