Abbreviations are always used in identifying some specific part or component of a firearm. In your particular case, "NMS" is referring to the lack of a magazine safety on a Smith & Wesson M&P pistol. With the lack of a magazine safety, this means your M&P pistol is capable of firing a round with no magazine in the pistol.

NMS = No Magazine Safety. This means the gun will fire with the magazine removed.

NMS = No Magazine Safety. This means the gun will fire with the magazine removed.

If you're looking at S&W pistols, specifically M&P models (including Shield) NMS stands for "no manual safety."

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Hi Jaden, NMS = No Magazine Safety. This means the gun will fire with the magazine removed.

NMS "No Magazine Safety" meaning the gun will fire with the magazine removed.

NMS = No Magazine Safety