NOTE: Before doing this instructable make sure that the gun is discharged in a safe direction.
UPDATE: I added Step 12 since the super glue didn't do the trick. I recommend you do all the steps for maximum strength.
Step 1: The Tools
Super Glue --Highly reccomended. Holds great.
Medium screwdriver--For removing screws around the rails
Small screwdriver --For removing screws on the side
Paper clip --For reinforcement, not shown in this instructable
Drill bit --For reinforcement, not shown in this instructable