Mine came exactly as yours is with the straight PG stock and the black magazine restrictor. I bought it new in 2014. Nothing really to note except that ours are the original real deal NP3 plated H20 guns done by ROBAR. Somewhat of a collectors item. Not much else to say about them except that they command a higher price and the actions run as smooth as greased lightening. Be happy you scored!
I tried to upload a picture of the box end that my gun was in but alas, it's not working. It just says; 11718 M4 H20 12ga PG some bar codes and the serial number of the gun. That's it.