9mm barrels for AR-9 pistol and rifle builds — blowback pistol-caliber. Precision-machined from corrosion-resistant steel in pistol and rifle lengths, with a 1/2×28 muzzle thread. No gas system (blowback).

AR-9 / 9MM Barrels

Filter

Choosing a 9mm AR Barrel

Barrel length

Pick pistol or rifle length to match your build. A 9mm AR is blowback — there's no gas block or gas tube — so the barrel pairs with a blowback bolt and buffer.

Twist rate

Around 1:10, which stabilizes common 115–147gr 9mm loads.

Thread and fitment

1/2x28 muzzle thread for 9mm muzzle devices. Confirm the barrel matches your AR-9 upper and bolt setup.

Frequently Asked Questions

Is a 9mm AR gas-operated?

No — blowback. The bolt and buffer run the action; there's no gas system on the barrel.

What thread pitch are these?

1/2x28.

Do you need an FFL to buy a barrel?

No — a barrel ships without an FFL.