Converting a 5.56/.223-chambered AR-15 to a PCC (pistol caliber carbine) in 9mm isn’t difficult. Brownells Gun Tech™ extraordinaire Steve Ostrem gives us an overview of the necessary mods. First, the barrel: “AR-9″ barrels have no locking lugs and no gas port because these guns are blowback operated. As a result, they use a heavier bolt / carrier assembly to help keep the breech closed (no gas key, either). A heavier 9mm buffer is also needed, but the good news is it’ll work with a standard carbine spring. You’ll need a new muzzle device, too, with an exit hole big enough for a 9mm (.355”) bullet. Last but not least, you’ll need a magazine well conversion unit, such as those from American Tactical, Hahn Precision and Stern Defense, because AR-9s use Colt SMG, Glock® or other pistol mags that are too small for the 5.56 magwell opening. Assemble it all like any other AR-15, do a check for headspace, and hit the range!
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please make a lot vids
I would only add one more thing. When torquing the barrel nut make sure it is aligned as if you were going to place a gas tube, IF NOT and you decide to put a Magpul handguard it will not be aligned properly because it uses the teeth on the barrel nut to do so. I am no expert but had that issue myself. Thank you.
Anyone else cringe when he dropped the hammer on that lower?
Thank you for the info!
Will be much better to make a built using a 9mm dedicated lower receiver or AR9
Cool. Hammer strike on the frame? Tisk tisk.
Likely, we all have done so at one time or another.
Buy a 9mm. upper and a mag block to accept 9mm. mags.
Wow I would just build or buy a 9mm carbine.