Smith & Wesson has issued an advisory regarding the performance of the manual thumb safety on the M&P .380 Shield.
The company says: "The function of the M&P 380 Shield EZ Manual Thumb Safety pistol can be influenced by the type and quality of ammunition used with the pistol. In the case of the M&P 380 Shield EZ Manual Thumb Safety, we have found that in very rare circumstances, ammunition that produces a high level of felt recoil can cause the manual safety to move from the fire to the 'safety on' position during firing. Should this occur, you will not be able to fire the next round unless and until the manual safety is reset to the fire position.
At Smith & Wesson, we are committed to designing and producing firearms that meet the highest quality and performance standards. To ensure that every Smith & Wesson handgun meets our standards for reliability and performance, as of April 4, 2018, we have engineered the manual safety so that it will be less susceptible to the influence of ammunition weight, velocity and loads. Any M&P 380 Shield EZ Manual Thumb Safety pistol produced before April 4 is eligible for a no-cost upgrade. To determine if this consumer advisory applies to your pistol, please utilize our serial number verification tool on our consumer advisory page. CLICK HERE to navigate to that page.
If your pistol is subject to this advisory, please call Smith & Wesson at 1-800-331-0852 or email us at [email protected]. A FedEx return label and shipping instructions to facilitate the return of your M&P 380 Shield EZ pistol will be mailed to you promptly. If you have any questions, you may call 1-800-331-0852 for more information."