Smith & Wesson issued what they're calling a consumer safety alert for all M&P15-22 rifles and pistols manufactured before February 1, 2019. At this time, if you own one of the affected rifles manufactured before that date, please stop use and have it inspected.
Smith & Wesson found two M&P15-22 firearms where the breech face counter bore depth was out of specification causing dangerous malfunctions. The lack of depth may allow the closing bolt to crush the rim of the case causing the round to fire, cycling the bolt, and potentially firing multiple times without depressing the trigger.
To find out if your M&P15-22 is one of the affected models, the bolt must be inspected. To do it yourself, order this tool, currently free of charge from the S&W website. If the gauge sits higher than flush, it's out of spec and could cause a deadly malfunction.
This picture shows the out of spec parts in question:
You could also send the bolt in to S&W for them to inspect, if you don't feel comfortable doing so yourself.
For more information on this consumer safety alert, please visit their website. In addition, we embedded their video explaining how to disassemble your M&P-22 as well as more detailed instructions on inspection than we provided here.
Here is their video:
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