M4 PDW Battery box

Here is my design of an M4 PDW extended battery box, I've tried many designs, but this was the winner for me.
It was designed for an SA-E12 PDW, but it will fit the most of PDW stocks.
There are 5 different cap sizes, depending of the stock and battery size you can chose the right one for you.

Print it vertically, the front part needs support.
At least 3 walls and more than 60% infill, layer height 0.15-0.2mm.