r/AR9

18K archived posts · Sep 2016 – Sep 2026

ARs, but with pistol cartridges

r/AR9

A place to discuss variants of the AR series that are chambered for pistol cartridges, including 9mm, .40S&W, .45ACP, 10mm, and 22LR.

Created May 3, 2016

24KMembers (last snapshot)

18KArchived posts

Rule 1: Don't be a jackass.

Rule 2: Keep political discussions relevant and fact based.

Rule 3: Don't link to, or ask where to find 3d printable gun parts.

Rule 4: Post a build-list, not just pretty pictures.

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