The B-19N Upper Handguard rail is a milled product made of D16T aluminum alloy. 

It is designed to be mounted above the gas tube on compatible handguards, including B-10M, B-10U, B-10L, B-21M, B-21U, B-21L, B-11, and B-11U models using four screws included in the kit. 

This setup forms a Picatinny rail above the gas tube that does not obstruct the iron sight line.

Specifications:

Material: D16T aluminum alloy

Weight: 65 ± 5 g

Overall Dimensions: (96 x 47 x 33) ± 5 mm

Operating Temperature Range: -50°С to +50°С

In the Kit:

The manufacturer reserves the right to make changes to the product design or configuration without prior notice, provided that these changes do not negatively affect the technical characteristics or consumer properties of the product and are intended to enhance design or production technology.