Step 6: Milling magazine
Using a rotary tool with a large milling bit I carefully removed the pellet guideway, making sure to leave the plastic posts which protected the screws that hold the magazine together in tact. Make sure to wear goggle or a face mask as this part can get very messy, with removed plastic flying all over the place.
Once your magazine is gutted take the 4 AA batteries and fit them inside, you want the fit to be snug, but not to inhibit the magazine from closing properly. I added a small 3mm scrap piece of foam inside the magazine housing to hold my batteries in place and prevent them from knocking around.