For our Advantage Tactical Sight customers and others with an M&P Shield who may not have seen this. Apparently, there has been a recall on some Shields. Check out the video and decide whether yours has been impacted. The S&W M&P Shield is a fantastic pistol in every way, so be safe and get it checked out asap.
Below is a picture of a Shield with the Advantage Tactical Sight. Ours checked out good. There was no problem. Use the attached video to rule out safety issues with yours.