The ProMag AR-15 M16 Magazine Quick Change Adapter Block 9mm is a 9mm magazine adapter block that installs in AR-15 lower receivers. It allows the use of 9mm Colt and SMG type magazines with 9mm upper receivers and is made of high strength polymer with steel hardware roller ejector and bolt stop. The installation is quick without the need to remove the bolt stop roll pin. It is also made in the USA.
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