Here is a good thing to do if you want the same ranges as stefans but you don't have the time to get all the materials. All you need for this is a micro dart body and a mega dart tip. Put the two together with whatever (tape, hot glue, etc.) and bingo, you have a super fast and far traveling micro mega dart.
Ok, we all know that this is a crapy gun but with this single barrel mod it can become a decent sidearm. Here are the materials you need:
Here is the mod: Take the SM250 apart and take out the 4 rotating barrel. Then take the black tube and cut it just on the edge where it used to push air into the rorating barrels so there is more space for the air to travel through. After this, cut just enough of the gun off so the crayola barrel can fit through because there is a tiny opening so it wouldn't be able to go in there. After this, put the crayola barrel in about 2 cm into the black tube and either electrical tape it or glue it in. After this I put electrical tape around the crayola barrel so it looked cooler. Put all the interals of the gun back in except the 4 rotating barrel. The ranges I got with this gun are about 40-50 feet ever time. I hope you all enjoy this mod