AR-15 Upper Assemblies
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Moriarti's AR-15 Upper Assemblies for Custom Builds & Upgrades
Discover AR-15 upper assemblies from Moriarti Armaments, built for shooters seeking quality, reliability, and performance. Our collection includes complete and stripped upper assemblies in popular calibers such as 5.56 NATO, .223 Wylde, 300 AAC Blackout, 7.62x39, 6MM ARC, 6.5 Grendel, .350 Legend, .450 Bushmaster, .50 Beowulf, .22 LR, and more. Choose from a variety of barrel lengths, handguard styles, muzzle devices, and finishes to build or upgrade your AR-15. Whether you're looking for a compact pistol upper, a carbine configuration, or a full-size rifle upper, Moriarti Armaments offers options compatible with most standard mil-spec AR-15 lower receivers.
How do I know which AR-15 upper assembly is compatible with my lower receiver?
Most standard AR-15 upper assemblies are designed around the common AR-15 receiver pattern, but compatibility depends on more than the receiver itself. Check the caliber, bolt carrier group, magazine requirements, buffer system, gas system, and any caliber-specific components listed for the upper. Some AR-15 calibers can use a standard lower receiver while requiring different magazines, bolts, or other components. Always verify the specifications of the upper and your existing firearm components before purchasing.
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AR-15 5.56/.223 Wylde 18" HBAR UPPER ASSEMBLY / QUADRAIL
An AR-15 5.56/.223 Wylde 18-inch stainless steel upper assembly with a quadrail handguard represents..
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AR-15 5.56/.223 Wylde 18" Spiral Fluted HBAR Upper | Black Claw Premium | 15" M-LOK | Competition Brake | Moriarti Arms
The AR-15 5.56/.223 Wylde 18" Black Claw Premium Upper Assembly combines accuracy, aesthetics, and d..
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AR-15 6MM ARC 16" MLOK UPPER ASSEMBLY WITH SLIP OVER BARREL SHROUD
Perfect for your next build, this 16" MLOK Upper Assembly is designed to give your AR-15 a sleek, ve..
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AR-15 7.62x39 10.5" Pistol Upper / 7" Fake Can / 1:10 Twist / 10" M-LOK Free Float – Moriarti Arms
The Moriarti Arms 7.62x39 AR-15 10.5" Pistol Upper Assembly is a rugged, USA-made upgrade designed f..
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AR-15 7.62x39 10.5" Pistol Upper / Slim Cone Brake / 12" M-LOK Rail – Moriarti Arms
The Moriarti Arms AR-15 7.62x39 10.5” Pistol Upper Assembly offers the perfect compact power solutio..
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AR-15 7.62x39 16" BARRETT STYLE 15" LIGHTWEIGHT MLOK UPPER
Features:Barrel Length: 16"Gas System: Carbine LengthBarrel Steel: 4150V Chrome Moly VanadiumBarrel ..
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AR-15 7.62x39 16" Burnt Bronze Upper | M-LOK Handguard | Moriarti Arms
Unleash the performance of the 7.62x39mm cartridge in your AR-15 platform with the Moriarti Arms® AR..
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AR-15 7.62x39 16" Elite Upper | Blue Titanium Cerakote | 1:10 Twist | 15" M-LOK | Moriarti Arms
The AR-15 7.62x39 Elite 16" Upper in Blue Titanium Cerakote is a striking and rugged option for buil..
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AR-15 7.62x39 16" Lightweight Blue Upper Assembly with Triport Muzzle Brake
AR-15 7.62x39 16" Lightweight Blue Upper Assembly with Triport Muzzle Brake - Compatible with AR-15 ..
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AR-15 7.62x39 16" Side Charging Upper / Carbine Gas / 15" M-LOK / BCG Included – Moriarti Arms
Step up your AR build with the Moriarti Arms AR-15 7.62x39 16” Side Charging Complete Upper Receiver..
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AR-15 7.62x39 16" Stainless Bear Claw Upper / Spiral Fluted Barrel / M-LOK / Triport Muzzle – Moriarti Arms
Push your AR-47 platform further with the Moriarti Arms 16" Stainless Bear Claw Premium Upper. Engin..
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AR-15 7.62x39 16" Upper Assembly / Multi-Port Shroud / M-LOK / Clear White – Moriarti Arms
Compliant. Unique. Purpose-built. This AR-15 7.62x39 16" Upper Assembly in anodized clear white adds..
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AR-15 7.62x39 16" Upper Assembly with Shark Muzzle Brake, FDE M-LOK | Moriarti Arms
Upgrade your AR build with the Moriarti Arms® AR-15 16" 7.62x39 Upper Assembly in Lightweight FDE Ce..
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AR-15 7.62x39 7.5" Krinkov Style Slim Nitride Pistol Upper Assembly / M-LOK – Moriarti Arms
Enhance your AR-15 pistol with the 7.62x39 7.5" Krinkov Style Slim Nitride Pistol Upper Assembly by ..
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AR-15 7.62x39 7.5" Slim Nitride Upper Assembly with Cerakote – FDE, ODG, Grey | Moriarti Arms
Upgrade your AR-15 with the 7.62x39 7.5" Slim Nitride Upper Assembly, now available with your choice..
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AR-15 Custom .350 Legend 12.5" Upper Assembly | M-LOK | A2 Flash Hider
Upgrade your AR-15 with this .350 Legend 12.5" Upper Assembly, specifically designed for those who d..
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AR-15 LEO TAKEDOWN BUILD BARREL COUPLING - CHOOSE CALIBER
AR-15 LEO TAKEDOWN BUILD BARREL COUPLING - CHOOSE CALIBER - Looking for additional barrel build for ..
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AR-47 7.62x39 16" Fluted Stainless Steel Tactical Upper Assembly with M-LOK | Moriarti Arms
The AR-47 7.62x39 16" Fluted Stainless Steel Tactical Upper Assembly / M-LOK offers a precision-buil..
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AR-47 7.62x39 16" Upper Assembly / 1:10 Twist / 12" M-LOK Handguard / Carbine Length – Moriarti Arms
Enhance your AR-15 platform with the AR-47 7.62x39 16" Upper Assembly, designed to deliver hard-hitt..
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AR-47 7.62x39 16" Upper Assembly / 1:10 Twist / 15" M-LOK Free Float Rail / Carbine Length – Moriarti Arms
Upgrade your AR-15 with the stopping power of the AR-47 7.62x39 16" Upper Assembly, built for reliab..
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AR-47 7.62x39 18" Upper Assembly / 1:10 Twist / Mid-Length Gas / 15" M-LOK Free Float Rail – Moriarti Arms
For shooters looking to push the ballistic limits of the 7.62x39 cartridge, the Moriarti AR-47 18" U..
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AR-47 7.62x39 5" Nitride Slick Billet Upper Assembly | Gold Muzzle | Charging Handle
The AR-47 7.62x39 5" Nitride Slick Billet Upper Assembly is a premium addition to your AR platform, ..
CMMG Deluxe Model Bravo .22LR Conversion Kit / Stainless Steel Bolt / No Magazine
Transform your 5.56/.223 AR-15 into a .22LR semi-automatic with the CMMG Deluxe Model Bravo .22 Conv..
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Moriarti AR-15 .338 ARC 12.5" Upper Assembly | M-LOK | Thread Protector
The Moriarti AR-15 .338 ARC 12.5" Upper Assembly delivers the perfect balance of compact maneuverabi..
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Moriarti AR-15 .458 SOCOM 16" Upper Assembly | MLOK Rail | FDE
The AR-15 .458 SOCOM 16" Black Upper Assembly offers powerful performance with a sleek design, perfe..
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Moriarti AR-15 .458 SOCOM 16" Upper Build – Slim M-LOK, Tanker Muzzle Brake, Big Bore
The AR-15 .458 SOCOM 16" Upper Build delivers powerful big-bore performance in a sleek, tactical pac..
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Moriarti AR-15 .50 Beowulf 10.5" Upper Build | 10" Slim Rail | Linear Compensator
Moriarti AR-15 .50 Beowulf 10.5" Upper Build is designed for those looking to build a powerful .50 B..
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Moriarti AR-15 .50 Beowulf 16" Complete Upper Assembly | M-LOK | Heavy Barrel | Big Bore AR Upper
The Moriarti AR-15 .50 Beowulf 16" Complete Upper is designed for shooters who want maximum big-bore..
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Moriarti AR-15 300 AAC Blackout 16" MLOK Upper Assembly with Slip Over Barrel Shroud | Pistol Length Gas System
The AR-15 300 AAC 16" MLOK Upper Assembly with Slip Over Barrel Shroud is engineered for shooters se..
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MORIARTI AR-15 300 BLACKOUT 16" DIAMOND CUT 12" MLOK UPPER ASSEMBLY / A2 / BLACK
MORIARTI AR-15 300 BLACKOUT 16" DIAMOND CUT 12" MLOK UPPER ASSEMBLY / A2 / BLACK Manufacturer: &n..
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Moriarti AR-15 5.56 16" M4 Carbine Upper | 12" Diamond M-LOK | A2 Flash Hider
Upgrade your AR with strength, style, and reliability. The Moriarti AR-15 5.56 NATO 16" M4 Carbine U..
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Moriarti AR-15 5.56/.223 16" Pencil Upper | 12" M-LOK | 1x7 Twist
Go ultra-light without sacrificing performance. The Moriarti AR-15 5.56/.223 16" Pencil Profile Uppe..
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Moriarti AR-15 5.56/.223 17.1" Pentagon Stainless Upper Assembly / Mlok / Predator
Transform your AR-15 build with the AR-15 5.56/.223 Pentagon Stainless Upper Assembly. Engineered fo..
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Moriarti AR-15 6.8 SPC II 16" MLOK Upper Assembly with Slip Over Barrel Shroud | Carbine
Assembly Features:Barrel:Length: 16" for a balance of maneuverability and accuracyMaterial: 41V50 St..
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Moriarti AR-15 7.62x39 16" M-LOK Upper – Slip Over Barrel Shroud
Looking to build a compliant, high-performance AR-15 in 7.62x39mm? Moriarti Armaments brings you a r..
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Moriarti AR-15 7.62x39 7.5" Nitride Pistol Upper Assembly / M-LOK
The AR-15 7.62x39 7.5" Nitride Pistol Upper Assembly / M-LOK is an ideal upgrade for your AR-15 pist..
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Moriarti AR-47 7.62x39 16" Stainless Black Wolf Premium Upper Assembly – MLOK, 12" Handguard
The AR-15 7.62x39 16" Stainless Black Wolf Premium Upper Assembly by Moriarti Armaments delivers exc..
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Moriarti Armaments AR-15 18″ 6MM ARC Stainless Upper Assembly / Quad / A2
Moriarti Armaments AR-15 18″ 6MM ARC Match Grade Stainless Upper Assembly (Rocket Man)Upgrade your r..
8" 5.7x28 AR-15 Complete Upper – BCG & CH Included | CMMG Compatible
Go compact with the Moriarti 8" 5.7x28 AR-15 Complete Upper, built around a 4150 CMV 5.7x28 barrel a..
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AR-15 .50 BEOWULF 12.7x42 18" Parkerized Upper Assembly / 15" Mlok
Build your ultimate big-bore AR-15 with this 18" .50 Beowulf upper assembly chambered in 12.7x42. Th..
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AR-15 5.56/.223 7.5" M-LOK Upper Assembly with SOCOM Style Muzzle Brake
AR-15 5.56/.223 7.5" M-LOK Upper Assembly with SOCOM Style Muzzle BrakeElevate your AR-15 with the 5..
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AR-15 7.5" Pistol Upper Assembly | Choose Caliber | Gradient Cerakote Finish | Premium Performance
Elevate your AR-15 build with this 7.5" Pistol Upper Assembly designed for both style and functional..
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Moriarti AR-15 300 BLK 7.5" Honeycomb Chrome Moly Upper Assembly | Choose Color MLOK | Trident Cone Flash Can
Moriarti AR-15 300 BLK 7.5" Honeycomb Chrome Moly Upper Assembly | Choose Color MLOK | Trident Cone ..
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Moriarti AR-15 5.56/.223 22" Spiral Stainless Steel Fluted Upper Assembly | M-LOK | Triport Muzzle Brake
Enhance your AR-15 build with the 22" Spiral Stainless Steel Fluted Upper Assembly, engineered for p..
16.1" 5.7x28 AR-15 Complete Upper – CMMG Barrel | BCG & CH Included
Build a 5.7x28 AR-15 around a full-length 16.1" barrel with this complete upper assembly. Designed t..
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AR-15 .350 Legend 18" Midlength Upper Assembly | 15" Free Float Rail | Enhanced Performance Upper
Upgrade your AR-15 with the .350 Legend 18" Midlength Upper Assembly featuring a 15" Free Float Rail..
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AR-15 .450 Bushmaster 18" Steel Black Nitride Upper Assembly / MLOK | Big Bore Performance
The AR-15 .450 Bushmaster 18" Steel Black Nitride Upper Assembly / MLOK is the perfect choice for th..
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AR-15 300 AAC Blackout 7.5" MLOK Upper Assembly – Flash Cone / 1x7 Twist
Enhance your AR-15 build with the AR-15 300 AAC Blackout 7.5" MLOK Upper Assembly, featuring a pisto..
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AR-15 300 Blackout 7.5" Pistol Zombie Slayer Upper Assembly / Mlok
Unleash superior performance with the AR-15 300 Blackout 7.5" Pistol Zombie Slayer Upper Assembly by..
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AR-15 300 Blackout 7.5" Mlok Upper Assembly / Blue Shroud / Blue Accents / Charging Handle Included
AR-15 300 Blackout 7.5" Mlok Upper Assembly / Blue Shroud / Blue Accents / Charging Handle IncludedU..