This is for use with 1/2" PVC magazines for homemade or modified toy blasters (Toy guns akin to Nerf blasters). Push darts through the flaps, and the most recent dart stays in the dart door to make an airtight seal. Makes reloading easy, and keeps you from getting caught off guard.Print DartDoorBody and DartDoorCap. Parts are in inches, so most printers will need to scale by 2540%. Hole sizes were tuned for a makergear M2 w/ 0.35mm nozzle, but step files are provided if you need to tweak the fit. Cut out 2 pieces of rubber sheet per DartDoorFlap.pdf drawing. Insert rubber sheets atop of the sloped sides of DartDoorBody, then place DartDoorCap atop of the rubber sheets. Screw the DartDoorCap to the DartDoorBody with 1" or 3/4" 6-32 screws of your choice Wrap duct tape (or any tape) around the junction of the two printed parts and flaps. This keeps the flaps from gradually slipping out.