The 
VORSK Air Nozzle VMP-1 Series Standard
 is a direct replacement part for the VORSK VMP-1 Gas Blowback (GBB) SMG, designed to ensure consistent performance and reliable cycling. 
Product Details
Compatibility: This air nozzle is specifically engineered for a perfect fit and seamless integration with the VORSK VMP-1 GBB SMG internals.
Material: The standard nozzle is made from a durable polymer, though a high-durability CNC aluminum upgrade version is also available from third parties.
Function: It is an exact replacement for the original part found in the VMP-1, crucial for maintaining optimal performance, consistent FPS (feet per second), and smooth firing.
Maintenance: It's recommended to have this as a spare part in your kit bag, as the polymer nozzle is a component that experiences wear and tear over time. When replacing it, you should also consider replacing the nozzle return springs (two are required), which are often sold separately.