The 
VORSK 13" V-Rail System & Barrel Nut (VMP-2MD) in Tan
 is available for purchase as a spare/replacement part from several online airsoft retailers. It is a polymer M-LOK handguard designed for the VORSK VMP-2MD gas blowback airsoft rifle. 
 
Product Details
The 
VORSK 13" V-Rail System for the VMP-2MD
 is a popular accessory due to the VMP-2 platform's modular design, allowing users to easily interchange handguards and other components. 
Material: The handguard is made of high-density polymer, making it tough and lightweight.
Accessory Compatibility: It features M-LOK negative space attachment slots on the sides and a full-length 20mm Picatinny rail on top for mounting accessories like scopes and sights.
Design: The rail system is specific to the VMP-2MD variant, which is the "recce rifle" version of the VMP-2, offering a balance of length and mobility.
Installation: The product, as sold by retailers, typically includes the barrel nut as a single item (VAC-12-03-TAN). This part is designed for the user to be able to modify their VMP-2 rifle.