AR-10MM 4" Slick Side Complete Cone Upper – M-LOK, Non-LRBHO

10mm Micro Upper: Specs & Features

Built for compact power and sleek design, the AR-10MM 4" Slick Side Cone Complete Upper by Moriarti Arms is the ideal choice for subgun-style AR builds. This upper features a 4" match-grade 10MM barrel capped with a slim cone muzzle brake, a slick side billet receiver, and a 4" M-LOK free-float rail, offering functionality and minimalism in one precision-engineered platform.

Perfect for pistol builds where LRBHO is not required, it ships fully assembled and tested and is ready to pair with Glock-mag AR lowers.

Key Features:

• Barrel: 4" 10MM match grade, 4150 CrMo steel, black nitride, 1:16 twist, 5/8x24 thread, slim cone muzzle brake

• Upper Receiver: Slick side 6061 billet aluminum, no forward assist or dust cover, hardcoat anodized, non-LRBHO

• Handguard: 4" slim M-LOK free-float, aircraft-grade aluminum, black hardcoat anodized

• Gas System: Blowback

• Bolt Carrier Group (BCG): Ramped, Glock & Colt compatible, 8620 steel, mag phosphate finish

• Charging Handle: Mil-spec

• Compatibility: Works with Glock-mag AR-9/40/45 lowers

• Weight: Approx. 3.2 lbs

• Country of Origin: USA

Want this with LRBHO? Check out the AR-10MM 4" Slick Side Complete Upper with LRBHO for a bolt hold-open feature.

NOTE: Images may not be an exact representation of the product.

FAQ

Is a lower receiver included?

No. This is an upper assembly only; the lower receiver, magazine and sights are not included.

What lower does it fit?

A dedicated pistol-caliber AR lower, such as a Glock-pattern lower using 10mm Glock-style magazines. A standard AR-15 lower with 5.56 magazines will not feed it.

How does it operate?

It is a direct blowback system, so it has no gas tube. A heavy PCC buffer is used for reliable cycling.

Does it have last round bolt hold open?

No. It is a Non-LRBHO design, so the bolt does not lock back on an empty magazine.

Related: 10mm Micro ARP · all Micro ARP pistols and uppers