This video provides a practical guide on converting a 5.56/.223 AR-15 rifle into a 9mm Pistol Caliber Carbine (PCC). Brownells Gun Tech Steve Ostrem details the necessary modifications, including replacing the barrel with an "AR-9" specific barrel designed for blowback operation (no gas port or locking lugs). He also explains the need for a heavier bolt/carrier assembly and buffer, while noting compatibility with a standard carbine spring. The video highlights the requirement for a new muzzle device with a larger exit hole and importantly, a magazine well conversion unit from brands like American Tactical, Hahn Precision, or Stern Defense, to accommodate various pistol magazines (Colt SMG, Glock, etc.). The process concludes with assembly, a headspace check, and a range test.
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