Easy CO2-powered Squib for Self-contained Blood and Gunshot Special Effects

Step 7 Put the Squib onto the Actor

Simply tape the tube to the actor in the position you want the shot to be, with the hole facing outward away from the actor's body.
Run the trigger assembly through a hole into the actor's pocket, hang it in the actor's beltloop, or place it anywhere else that it will be concealed from the audience/camera but still accessible to the actor.
Put the actor's costume on over the effect tube and make a small slit in the costume directly over the Blu-Tac plug. The larger the slit, the more blood will fly through the air. The smaller the slit, the more blood will stay on the costume. You are now ready to trigger the effect.