The MSBS GROT family of carbines is already present in the Polish Army and available to civilians for a while now (Grot from Radom available on the civilian market). For the time being, airsoft players cannot use on in their games due to a lack of an airsoft replica, but a prototype version of the grenade launcher can sweeten the wait a bit.
Recreated in the form of a 3D model, it is a concept version, adapted to both bull-pup and classic versions. The characteristic shift of the trigger mechanism to protect the shooter's hand or the integrated angular grip at the back are quite characteristic. The differences are visible in the form of a mounting rail, lack of grooving in some places and, of course, it is made entirely of filament.
The project includes parts of the trigger mechanism, but the author did not include the required elements for assembly, indications as to the printing technology and other useful parameters. The whole thing can be treated as an interesting looking accessory or a functional grenade launcher replica.
The entire project is available as the ASG Grenade launcher Free 3D model and it's free.