This is how to make a holster.
Step 1 get card board mostly thin.
Step2 then cut it to look like the barrel of gun as pic.
Step 3 then staple around the edges.
Step 4 duct tape!
Step 5 take a piece of duct tape and stick it to the back of another staple to a side.like pic
Step 1: Step 2
I am sorry this my first instucable and i hope you have the ideas