I was shooting some slugs earlier with my Maverick 88 12 gauge. Every time I'd pull the trigger I'd get a click and the primer on the slug would have a little dent in it. They all fired after a second trigger pull. This was slugs from two different boxes as well. I was using Winchester Super X 2 3/4 hollow point slugs. I bought it used and by the look of it it's old, could the fireing pin spring be weakening ?