Golden Eagle BD Style 12.5" inch M-LOK M4 GBB Airsoft Rifle - Green Gas Combo - (Black)Bundled Products: Golden Eagle BD Style 12. 5" inch M LOK M4 GBB Airsoft Rifle Built with a full metal CNC machined M LOK handguard and receiver High density polymer stock and pistol grip Designed with a fill length rail with removable front and rear flip up sights with built in fiber optics The lightweight textured pistol grip increases handling and weapons manipulation Six position stock with easy adjustments by using the slim and responsive lever