Serial Product Number is Weapon Industries code for register as standard or copyright for the weapon without other industries to copy or forge this weapon.
Example: the RT-3D Plasma Pulse Rifle is PPR-3-02-D Blaster Rifle, mean "PPR" is Plasma Pulse Rifle, "3" is -3 and "02" is 300,002 ADG of product, some variants in weapon are add after 3 part is "D", and mean "Blaster Rifle" was standard type of energy weapons.
Some Maximum code like Type-7/1 was Ran-27-9 Laser Rifle. See in secrecy.