What do I need for a 9mm AR-9?
All you need at that point is the AR9 upper to complete the ensemble. A dedicated AR-9 lower, on the other hand, is unique because it directly accepts Glock-style 9mm magazines. Since it is still utilizes the AR platform, you'll need a 9mm specific buffer system, a new bolt carrier group, and an upper receiver with a barrel chambered in 9mm.
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