Originally Posted By: Toby Barclay
I am sorry to be a SA but this is a good example of why leaving ANYTHING in a gun when put away is a bad idea.
Why would you? I can think of no useful purpose.


It doesn't serve any useful purpose, but some still believe that it helps keep tension of the springs. The best caps are those with hard rubber primers made of thin metal plated with nickel. For practice I use light alloy ones with spring tensioned brass primers because that is all I could find locally in 16 ga.