Easy to build very fun to shoot!
Step 1: The Tools You'll Need
You will need a medicine bottle, a pen, a drill and a 5/16 drill bit.
Step 2: Take Pen Apart
You pop the tip of the pen out and get the ink out. Next you take the end cap of the pen off. It should look like this.
Step 3: Drill Whole in Pill Bottle
Use your drill and your drill bit to drill a whole at the bottle. The bit should be 5/16. It should look like this.
Step 4: Then Drill a Hole in the Side
You can use the same size drill bit to complete this step. It should look like this.
Step 5: Final Step Put Pen in Medicine Bottle
Put your pen in the hole towards the bottom and take some bb's and put them in. It should look like this. Then try it out!