AR-9 16" LRBHO Blowback 9mm Complete Upper Assembly, Slick Side, BCG & Charging Handle

AR-9 16" Upper: Specs

Upgrade your PCC with the Moriarti AR-9 16" LRBHO Blowback 9MM Complete Upper Assembly, engineered for dependable performance and smooth operation. Built around a premium 7075-T6 billet slick side upper receiver, this upper features an integrated Last Round Bolt Hold Open (LRBHO) system that locks the bolt open after the final round, providing a familiar AR-15 manual of arms.

Powered by a proven blowback 9mm operating system, this complete upper includes a 16-inch match-grade barrel, 15-inch free-float M-LOK handguard, Glock & Colt compatible ramped bolt carrier group, and a standard charging handle. The blowback system is valued for its simplicity, reliability, and low maintenance, making it one of the most popular operating systems for 9mm AR platforms.

Compatible with most mil-spec AR-9 lower receivers, this upper is ideal for PCC competition, recreational shooting, training, and custom rifle builds.

Each upper is professionally assembled, tested, and proudly manufactured in the USA by Moriarti Armaments.

Key Features

• Platform: AR-9
• Caliber: 9MM
• Operating System: Blowback
• Integrated Last Round Bolt Hold Open (LRBHO)
• 16" Match Grade 4150 CrMo Barrel
• 1:10 Twist
• Black Nitride Finish
• Billet 7075-T6 Slick Side Upper
• Glock & Colt Compatible Ramped BCG
• 15" Free-Float M-LOK Handguard
• Standard Charging Handle Included
• Made in USA

What is LRBHO on an AR-9?

LRBHO (Last Round Bolt Hold Open) automatically locks the bolt to the rear after the final round is fired, providing the same manual of arms found on a standard AR-15. This feature makes reloads faster, allows shooters to immediately confirm the firearm is empty, and enhances the overall shooting experience for 9mm PCC and AR-9 platforms.

Note: Precision milled for use with Glock style MA-9 lower receivers. UPPER ASSEMBLY COMES COMPLETELY ASSEMBLED AND TESTED. MAKE IT A COMPLETE RIFLE BY CHOOSING OPTIONS ON TOP. WE MAY HAVE VARIATIONS ON RAILS, BASED ON STOCK AVAILABILITY. THE SAME EXCELLENT QUALITY. MADE IN USA BY MORIARTI ARMAMENTS.

FAQ

What lower does it fit?

A dedicated pistol-caliber AR lower that takes Glock-style 9mm magazines. A standard AR-15 lower with 5.56 magazines will not feed it.

How does it operate?

It is a direct blowback pistol-caliber design with no gas tube or gas block, so a heavy PCC buffer is used for reliable cycling.

Does it have last round bolt hold open?

Yes. It has LRBHO, so the bolt locks back after the last round when used with an LRBHO-compatible lower.

Is a lower receiver included?

No. This is an upper assembly only; the lower receiver and magazine are sold separately.

Related: AR-9 upper assemblies · pistol caliber carbines

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