AR-10mm 16" Side Charging Complete Upper Receiver with LRBHO, M-LOK Rail, BCG

AR-10mm 16" Upper: Specs

The AR-10MM 16" Side Charging Complete Upper with Last Round Bolt Hold Open (LRBHO) is purpose-built for your next 10mm AR pistol-caliber carbine build. Featuring a non-reciprocating side charging billet upper, precision-machined barrel, and fully assembled bolt carrier group, this upper delivers premium performance in a rugged, lightweight package.

Manufactured in the USA by Moriarti Arms, this complete upper offers enhanced handling and consistent reliability, with the added benefit of side charging convenience and Glock mag compatibility. Perfect for shooters seeking added control, improved ergonomics, and full 10mm stopping power.

Upper Features:

• Barrel: 16” 10MM Match Grade Barrel, 4150 CrMo steel, 1:16 twist, black nitride finish, 9/16x24 threads, A2 flash hider

• Upper Receiver: Side Charging Billet 6061 Aluminum, LRBHO-enabled, MIL-8625 Type III Class 2 anodized, adjustable slide lock, dust cover trap door

• Handguard: Rifle-length Slim M-LOK Free-Float Rail, black anodized, aircraft-grade aluminum

• Bolt Carrier Group (BCG): Ramped .40 S&W/10MM, Glock & Colt compatible, 8620 steel, mag phosphate finish

• Gas System: Blowback operation

• Charging Handle: Side charging, non-reciprocating

• Weight: Approx. 4.2 lbs

• Assembly: Fully assembled and tested

• Origin: Made in the USA

• Shipping Lead Time: Ships in 4 weeks

Looking for a standard top-charging option?

Check out the Moriarti AR-10MM 16" Slick Side M-LOK Complete Upper Receiver w/ LRBHO.

Images may not be an exact representation of the product. 

FAQ

What lower does it fit?

A dedicated pistol-caliber AR lower that takes Glock-style 10mm 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.

What is a non-reciprocating side charger?

The charging handle is on the side of the upper and does not move while firing, so you can charge it without breaking your grip.

Is a lower receiver included?

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

Related: AR-10mm upper assemblies · pistol caliber carbines