AR-10mm 8.5" Pistol Caliber Side Charging LRBHO Complete Upper with BCG

AR-10mm 8.5" Upper: Specs

This AR-10MM upper is built on a non-reciprocating side charging billet upper receiver with LRBHO (Last Round Bolt Hold Open). Expect an approximate 8-week lead time for shipping, as these are manufactured on a monthly schedule.

Key Features:

• Barrel: 8.5" 10MM match-grade AR barrel, 4150 CrMoV steel with black nitride finish, chambered in 10MM. Twist rate: 1:16, 5/8-24 muzzle brake threads. Barrel finished off with A2 flash hider.

• Upper Receiver: Pistol caliber side charging upper receiver machined from 6061 billet aluminum, matte black hard-coat anodized per Mil 8625 Type 3 Class 2. Compatible with Glock mag AR-9/40/45 components and most aftermarket parts. Features an adjustable tension slide lock on the charging handle, with a rear dust cover trap door.

• Gas System: Blowback.

• Handguard: Lightweight free-floating 7" slim M-LOK rail made from aircraft-quality aluminum with black hardcoat anodized finish.

• BCG: AR-40 .40 S&W/10mm ramped BCG (Glock & Colt compatible), made of 8620 steel with mag phosphate finish. Ramped carrier works with standard AR hammers and is precision-milled for use with Glock-style lower receivers. M-16 cut, full-auto rated (compliant with BATFE regulations).

• Charging Handle: AR-15 charging handle included.

Complete Upper Assembly: The upper comes fully assembled and tested, ready for use. Manufactured in the USA by Moriarti Armaments.

Note: Images may not be an exact representation of the product. Slight variations in mlok design may occur based on parts availability. Approximate lead time: 8 weeks.

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