The magazine was empty. I was becoming familiar with working the gun as it's my 1st handgun so I haven't loaded a magazine to chamber a round yet.
Do any of you have problems racking the slide on your M&P Shield? Every time I rack it back the slide lock engages and will not release unless I engage the slide release. Maybe I'm screwing something up.
Take an NRA Basic Pistol course. You will feel better.