First, you need to get those pesky poles out of the barrels. Use a pair of needle nose pliers and twist them out. People on NerfOnline have said that pulling them out results in the gun not firing. There are air restrictors in the back of the barrels, as you can see, but some people on NO say that if these are removed, parts fall out of the barrel that aren't supposed to. Anyway, I went with safety. Twist the poles out and you won't have problems.

Open the gun. It's pretty simple, and everything seems to be glued together. The spring that puts resistance on the trigger may or may not come flying off. On one of my guns, it did, but on the other one, it wouldn't come off for the world. Notice where the trigger mechanism attaches to the case. You'll need to put this back later.

If you lift the barrel assembly out of the case, you can pull the plunger all the way out of its tube. This is a pic of the end of it. See that hole? Plug it up. I used hot glue; epoxy also works.

OK, this is the tough part. This pic is of the barrels upside-down. The arrow points to a hole in the barrel that exists on both sides. You have to plug these up. It's tough to get your fingers in there. I used duct tape and a screwdriver.

That is the duct tape on the hole. Coming in from the right is the screwdriver. Use it to smooth the duct tape over. Additionally, you can put the tape on the screwdriver and then use the screwdriver to apply it. Just plug those holes up.

Put it all back in the case (refer to the first pic) and put the screws back in. It now fires more types of darts. Normal 3" stefans don't work very well; they wobble in flight. I found that 1.5" stefans work well. I have not tried this gun outside yet, but with 10 pumps, it fires almost 30 feet in a straight line. It's very accurate with the included mega darts. I hope to put PVC barrels on this thing soon. With my trusty LnL dead (it was really never any good) this is a great discovery for me. A good sidearm that's still in production. I bought two :). I really like the way it can fire two darts semi-auto. 1vs1 wars are actually pretty fun using these guns.