The next generation of Micro Roni is here! Improving on their past generation models, CAA has made what could be the ultimate conversion kit – the Micro Roni Generation 4, or the Micro Conversion Kit (MCK). Get this kit from Machine Guns Kings for the cheapest price online to convert your Smith & Wesson M&P 2.0 to the ultimate SMG. NOTE: Not compatible with safety M&P models. *Fits 3.6″ and 4.25″ models only*