AR-10MM Upper Assembly – 10″ Side Charging, LRBHO, M-Lok Rail, Complete with BCG – Moriarti Arms

Uppers

AR-10MM Upper Assembly – 10.5″ Side Charging, LRBHO, M-Lok Rail, Complete with BCG – Moriarti Arms

The 10MM AR upper receiver assembly from Moriarti Arms is designed for shooters looking to build a compact, high-performance pistol caliber carbine or pistol. Built around a non-reciprocating side charging billet upper, this complete upper features Last Round Bolt Hold Open (LRBHO) compatibility and a precision-matched 10.5” barrel, making it an ideal option for Glock-magazine AR builds in 10mm.

Crafted in the USA by Moriarti Armaments, this upper is engineered to provide maximum reliability with enhanced ergonomics and blowback operation.

Features:

Barrel:

• 10.5” 10MM match-grade barrel

• 4150 CMV steel, black nitride finish

• 1:16 twist rate

• 9/16x24 threads

• Includes A2 flash hider and crush washer

Upper Receiver:

• Billet 6061 aluminum, hardcoat anodized

• Non-reciprocating side charging

• Adjustable tension slide lock

• Dust cover trap door

• Mated to match AR-9/AR-45 lowers

• Compatible with Glock Mag AR-9/40/45 components

Gas System:

• Blowback-operated

• No gas block required

Handguard:

• 10” slim M-LOK free-floating rail

• Aircraft-grade aluminum

• Black anodized finish

Bolt Carrier Group (BCG):

• .40 S&W / 10MM ramped BCG

• 8620 steel, mag phosphate finish

• Compatible with Glock and Colt lower receivers

• Ramped for use with standard AR-15 hammers

• M-16 cut, full-auto rated (complies with BATFE regulations)

Charging Handle:

• Standard Mil-Spec AR-15 charging handle

Additional Notes:
This upper comes fully assembled and factory-tested. Please allow approximately 8 weeks lead time due to batch manufacturing. Images may not reflect exact configuration due to minor ongoing production variations - mlok may have a variation in design based on stock availability. 

Made in the USA by Moriarti Arms