Dedicated .22rfs like Tippman's, AM180s, and Norrel 10/22s are excellent NFA toys. But if you're looking to buy a single do-all NFA MG consider that a M16 can accept any number of .22lr uppers/conversion units. Kuehl, Ceiner, Lakeside LM7 are just a few. These kits/uppers are reasonably...