Expo Arms Barreled AR9 Upper Receiver - 9mm - 5.5"

Overview

The Expo Arms Barreled AR9 Upper Receiver pairs a 5.5-inch 9mm barrel with a 4-inch M-LOK compatible handguard on a straightforward blowback-operated upper designed to mount onto any compatible 9mm lower receiver. The barrel features a 1/2x36 threaded muzzle equipped with a flash hider, ready to accept standard 9mm-pattern muzzle devices. Operating via a blowback system without a gas block, tube, or port, this compact upper is ideal for building a pistol-caliber carbine. It ships without a bolt carrier group or charging handle, allowing builders to select 9mm-specific components tailored to their preferred buffer system.

Price & Stock History

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