Double Bell GP-25 AK Gas Grenade Launcher with Pistol Kit
 
Full Metal Construction
Compatible with Standard Length Double Bell / Dboys AK Airsoft Rifles
High Density Polymer Grip
Adjustable Sighting System
GP-25 with External 20 rail set can let it be independent Grenade Pistol  
Package Includes one 40mm Grenade Cartridge (VOG-25 style grenades)