I recently got a good deal on 2 nerf longstrike cs-6s, so I am going to try to make one select-fire. In the mean time however, I found the adjustable stock pretty inadequate. It is either all the way out:


or all the way in:


When it is out, it has a good length of pull, but is longer than it needs to be. When it is in, you can’t get you hand on the grip very comfortably. To over come this, I dismantled the blaster, and found that what locks the stock into those two positions is just a hole drilled into the back of the blaster that a little tab pops into. All you need to do to fix the problem is drill another hole of the same diameter in between the existing ones:


you then have a shorter length of pull but enough room for your trigger hand: