i have 3 of the blaster from star wars, empires trikes back and return of the Jedi and only one had one of the battery compartment locks. and it only had one!  so i made my own. its not perfect but its a start i will eventually and the ribbing on the side and the indicator on the top.  Feel free to make improvements just please post them. Up dated 1/9/2019 and some thing to make it look more like the real one