I purchased this at a garage sale the other day and know the battery is out (no charger either) but it works in mech mode. There are a few other e-mags on this thread already but my understanding is the previous owner customized this quite a bit (his words). I have no clue what the three parts are to the left of the gun (one black two blue) and if they are for this gun or one of the others. What is it worth?