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ProMag PM237B : This magazine quick change adapter block is for your AR15/M16, coverting your rifle from accepting standard AR15 .223/5.56 mags to Colt 9mm SMG magazines..
The ProMag PM237 is a magazine block adapter which easily installs in a standard Ar-15 lower receiver to allow the use of 9mm Colt SMG pattern magazines. This is the key component that you must have in order to make your AR-15 9mm conversion work. The block is constructed of high strength polymer with steel hardware roller ejector and bolt stop. - ProMag PM237 - Converts from standard AR-15 lower to 9mm AR-15 lower - Allows for use of 9mm Colt SMG magazines - Made from high strength polymer with steel hardware - Matte Black
PM237B - AR-15/ M16 9mm Magazine Quick Change Adapter Block