Update: For those of you have found that your sliding stock no longer locks in place. Please refer to the review on AirsoftRetreatForums, it really works
Also, I stuck in a stock TM MP5 Inner Barrel, had to cut it down a bit to stick it in and the groupings have improved greatly from 8's to literally 3's. Now all I need to do is find a more powerful motor to speed up the ROF. If not a larger battery.