Geonox Airsoft features a Lancer Tactical LT51 (AK74) AEG that comes equipped with an under barrel 40mm grenade launcher... "In this video we take a look at the Lancer Tactical LT51 AK74. Double Bell's Under Barrel Grenade Launcher is mounted directly. The AK is a SAEG (Semi Automatic Electric Gun) with 1.3 joules. The whole thing is from 18 and only has a semi, not a full car. The Grenade Launcher is filled with 36 BBs and powered by Green Gas. This is used to clean every hallway and room in the CQB."