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  1. Why the Ridges on the underside of the slide?

    MP SHIELD Pistols
    Wondering why S&W put the machined ridges on the underside of the slide. Different from the 9mm and .40, and feels like crap when you pull back the slide if you have a full mag in. Attached a picture of the brass buildup on the ridges i'm talking about. This really seems like a poor addition...
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