M20 SMG from Halo 5 Guardians, scaled to the length as seen on this link https://www.halopedia.org/M20_SMG Exstracted by Soul_ of the Facepunch forum https://facepunch.com/showthread.php?t=1545045, converted to OBJ and STL by myself. OBJ is included if you want to edit the model to reposition the stock or forward grip.
