Ports in the L85 from Killing Floor 2, replaces the body, standard foregrip (and a rail from the Payday 2 model), and the pistol grips.
I think it turned out pretty well :D
Hope you enjoy.
UPDATE: 10/3/17 - I FINALLY STOPPED BEING A LAZY FU UPDATED THE MOD. Now it should work perfectly as it originally did. Sorry for being lazy af taking so long.