Der riese 6 Pack A Punch Weapons at once. multi gun glitch

In order to have this many guns, you have to be able to do the multi gun glitch, which can be found here on youtube. You have to get i think it was like 12 guns out of the box in order to upgrade six of them. Because everytime you PaP a weapon, (if you have more than 2 guns) you will lose the gun you are holding as you grab your pap weapon.