Well anyway, I was walking around in the mall with a few buddies, and we wandered into KB toys, and saw the buzz bee shotgun. My friend prompted me to buy it, and we had fun walking around shooting random people in macy's

Now I want to mod it. I have ripped out the + rods in the clips, removed the AR's, and sawed off the end. I have a lot of 9/16th brasss lying around, is there a barrel mod I could do thats actually worth it? Should I replace the spring? what have you done?
Thanks,
L_M_S_