9MM AR Pistol Kits | AR-9 Pistol Build Kits | Moriarti Armaments

9MM AR Pistol Kits & AR-9 Kits

Shop premium 9MM AR pistol kits and AR-9 kits from Moriarti Armaments for compact, reliable pistol-caliber AR configurations. Our 9MM AR pistol kit selection includes short-barrel options, blowback 9MM systems, Glock-compatible configurations, and available LRBHO (Last Round Bolt Hold Open) models. Choose from multiple barrel lengths, handguard styles, finishes, and component combinations to match your preferred AR pistol setup. Whether you're looking for a compact AR pistol kit, an AR-9 pistol kit, or components for a custom 9MM platform, Moriarti offers American-made parts engineered for dependable performance, compatibility, and durability.

What is the difference between a 9MM AR pistol kit and a standard AR-15 pistol kit?

A 9MM AR pistol kit typically uses a blowback operating system rather than the gas-operated system found on most 5.56 AR-15 pistols. It also requires 9MM-compatible components such as the barrel, bolt, magazine system, and properly matched buffer setup. Some AR-9 pistol kits also feature LRBHO, allowing the bolt to remain open after the final round.