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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-800x800-228x228.webp "AR-15 16\" 5.56/.223 BARRETT STYLE LIGHTWEIGHT UPPER ASSEMBLY / 15\" MLOK")
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AR-15 16" 5.56/.223 BARRETT STYLE LIGHTWEIGHT UPPER ASSEMBLY / 15" MLOK
Features:Barrel Material: 4150V Chrome Moly Vanadium, nitride-coated for superior accuracy and durab..
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AR-15 16" 5.56/.223 Barrett Style Lightweight Upper Assembly, 15" M-Lok, Red Anodized Finish
The AR-15 16" 5.56/.223 Barrett Style Lightweight Upper Assembly features a premium nitride-coated 4..
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AR-15 16" 5.56/.223 Straight Fluted Stainless Tactical Upper / 12" MLOK / Carbine | Moriarti Arms
The AR-15 5.56/.223 16" Stainless Steel Straight Fluted Tactical Upper from Moriarti Arms delivers u..
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AR-15 16" Barrett Style Lightweight Upper, FDE M-LOK Rail | 300 Blackout or 7.62x39 | Moriarti Arms
Upgrade your AR-15 with the Moriarti Arms 16" Barrett Style Lightweight Upper, finished with a rugge..
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AR-15 20″ 6MM ARC Hexagon Fluted Stainless Steel Upper Assembly / Mlok
The Moriarti Armaments AR-15 20″ 6MM ARC Hexagon Fluted Stainless Steel Upper Assembly / M..
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AR-15 20″ 6MM ARC Match Grade Nitride Upper Assembly / Rocket Man
The Moriarti Armaments AR-15 20″ 6MM ARC Match Grade Nitride Upper Assembly / Rocket Man c..
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AR-15 22 ARC 24" Stainless Nitride Fluted Upper Assembly / MLOK | High-Performance Rifle Upper
The AR-15 22 ARC 24" Stainless Nitride Straight Fluted Upper Assembly / MLOK brings modern cartridge..
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AR-15 300 AAC blackout 16" pistol length upper assembly / 15" Mlok / Tri
Transform your AR-15 with this 300 AAC Blackout 16" Pistol Length Upper Assembly. Designed for easy ..
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AR-15 300 AAC Blackout 16" Stainless Black Wolf Upper Assembly / Mlok
AR-15 300 AAC Blackout 16" Stainless Black Wolf Upper Assembly / Mlok. 300 blackout caliber uppers u..
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AR-15 300 AAC blackout 16" stainless steel black diamond upper assembly
AR-15 300 AAC blackout 16" stainless steel black diamond fluted upper assembly. 300 blackout caliber..
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AR-15 300 AAC Blackout 16" Stainless Steel Diamond Fluted Upper Assembly | MLOK Rail
The AR-15 300 AAC Blackout 16" Stainless Steel Diamond Fluted Upper Assembly is a high-performance u..
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AR-15 300 AAC Blackout 16" stainless steel spiral fluted tactical upper assembly /Mlok
AR-15 300 AAC Blackout 16" stainless steel spiral fluted tactical upper assembly. 300 Blackout ..
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AR-15 300 AAC BLK 14.5" Pistol Upper Assembly / 7" Fake Suppressor / M-LOK – Built for Precision and Style
AR-15 300 AAC BLK 14.5" Pistol Upper Assembly / 7" Fake Suppressor / M-LOK – Built for Precision and..
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AR-15 300 Blackout 16" Chrome Moly Upper Assembly - Anodized Blue with Triport Muzzle Brake
AR-15 300 Blackout 16" Chrome Moly Upper Assembly - Anodized Blue with Triport Muzzle BrakeUpgrade y..
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AR-15 300 BLACKOUT 16" STAINLESS BLACK CLAW UPPER ASSEMBLY / 12" MLOK
AR-15 300 BLK 16" STAINLESS BLACK CLAW PREMIUM UPPER ASSEMBLY / MLOK Barrel - 16" 416R stainles..
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AR-15 300 Blackout 16" Stainless Straight Fluted M-LOK Upper | Moriarti Arms
Step into the world of subsonic and supersonic performance with the Moriarti Arms AR-15 300 Blackout..
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AR-15 300 Blackout 6" Modular Pistol Upper Assembly / Hybrid Mlok / A2
AR-15 300 Blackout 6" Modular Pistol Upper Assembly | Hybrid MLOK | A2 Flash HiderFeatures:Premium B..
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AR-15 5.56 16" Upper Assembly - Blue Titanium Cerakote, M-Lok Handguard, A2 Flash Hider
The AR-15 16" 5.56 Upper - Blue Titanium Cerakote is designed for shooters seeking durability a..
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AR-15 5.56 NATO 5" Micro ARP Upper | Cookie Cutter | M-LOK | Moriarti
The Moriarti AR-15 5.56 NATO 5" Cookie Cutter Upper Assembly combines aggressive styling with an ult..
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AR-15 5.56 NATO 5'' PISTOL UPPER ASSEMBLY / BILLET UPPER / GOLD MUZZLE BRAKE
AR-15 5.56 NATO 5'' PISTOL UPPER ASSEMBLY / BILLET UPPER / GOLD MUZZLE BRAKE FEATURES: Chamber:&n..
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AR-15 5.56 NATO 5'' SLICK BILLET UPPER ASSEMBLY / 4'' MLOK / SHARK / FLAG DC and CH
AR-15 5.56 NATO 5'' BILLET UPPER ASSEMBLY / 4'' MLOK / SHARK / FLAG DC and CH:Featuring a sleek desi..
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AR-15 5.56 NATO 6" Modular Pistol Upper Assembly | Hybrid MLOK | A2 Flash Hider
Upgrade your AR-15 build with the Moriarti Arms 6" 5.56 NATO Modular Pistol Upper Assembly—engineere..
AR-15 5.56 NATO 7.5" Complete Billet Side Charging Upper / Non-Reciprocating / BCG
AR-15 5.56 NATO 7.5" Complete Billet Side Charging Upper / Non-Reciprocating This drop-in upper..
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AR-15 5.56/.223 10.5" Pistol Upper Assembly / Shroud / Burnt Bronze
Elevate your AR-15 pistol build with this high-performance 10.5" AR-15 pistol upper assembly, design..
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AR-15 5.56/.223 10.5'' CARBINE UPPER ASSEMBLY / M-LOK / ROCKET MAN
AR-15 5.56/.223 10.5'' CARBINE UPPER ASSEMBLY / 10'' M-LOK / ROCKET MAN is a perfect addition to you..
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AR-15 5.56/.223 16" Black Diamond Fluted Tactical Upper w/ 12" MLOK & Xtreme Brake | Moriarti Arms
Stand out with precision and style with the AR-15 5.56/.223 16" Black Diamond Tactical Upper Assembl..
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AR-15 5.56/.223 16" Carbine Upper Assembly / Gold Finish / Triport Muzzle Brake
Upgrade your AR-15 with this 5.56/.223 16" Carbine Upper Assembly featuring a stunning Gold TiN Coat..
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AR-15 5.56/.223 16" Green Diamond Tactical Upper Assembly / Mlok
AR-15 5.56/.223 16" Green Diamond Tactical Upper Assembly / Mlok. Barrel is exclusively designed for..
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AR-15 5.56/.223 16" M4 Carbine Upper w/ 15" MLOK Rail – Cerakote Finish | FDE, ODG, Grey | Moriarti Arms
Customize your build with a top-tier AR-15 5.56/.223 16" M4 Carbine Upper Assembly, available in you..
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AR-15 5.56/.223 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 5.56/.223 16" slick side diamond stainless steel upper assembly / 10" Mlok / Tri
This AR-15 5.56/.223 16" Upper Assembly is perfect for building or upgrading your rifle. CA/NY compl..
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AR-15 5.56/.223 16" Stainless Steel Spiral Fluted Upper Assembly | Mlok | Tactical Upgrade
Upgrade your AR-15 with this 5.56/.223 16" Stainless Steel Spiral Fluted Upper Assembly designed for..
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AR-15 5.56/.223 17.1" Pentagon Black Nitride Upper Assembly / Mlok / Triport Brake
Elevate your AR-15 build with the AR-15 5.56/.223 17.1" Pentagon Black Nitride Upper Assembly. This ..
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AR-15 5.56/.223 18" Stainless Steel Diamond Fluted Upper | 1:8 Twist | 15" M-LOK | Moriarti Arms
The AR-15 5.56/.223 18" Stainless Steel Diamond Fluted Upper Assembly is designed for marksmen who d..
-228x228.webp "AR-15 5.56/.223 18\" Stainless Steel Spiral Fluted Upper Assembly / Mlok Rail")
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AR-15 5.56/.223 18" Stainless Steel Spiral Fluted Upper Assembly / Mlok Rail
The AR-15 5.56/.223 18" Stainless Steel Spiral Fluted Upper Assembly with Mlok rail offers precision..
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AR-15 5.56/.223 18" Stainless Steel Straight Fluted Upper | 1:8 Twist | 12" M-LOK | Triport Muzzle Brake | Moriarti Arms
The AR-15 5.56/.223 18" Stainless Steel Straight Fluted Tactical Upper Assembly is engineered for pr..
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AR-15 5.56/.223 20" Black Diamond Competition Upper Assembly – MLOK / Triport Muzzle Brake
You asked, and we listened. Introducing the limited edition AR-15 5.56/.223 20" Black Diamond Compet..
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AR-15 5.56/.223 20" STAINLESS STEEL BLACK CLAW UPPER ASSEMBLY / MLOK / TRI
Upgrade your AR-15 build with the AR-15 5.56/.223 20" Stainless Steel Black Claw Upper Assembly / ML..
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AR-15 5.56/.223 20" stainless steel diamond fluted tactical upper assembly
The AR-15 5.56/.223 20 Stainless Steel Diamond Fluted Tactical Upper Assembly is a key component to ..
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AR-15 5.56/.223 20" Stainless Steel Spiral Fluted Tactical Upper Assembly with M-LOK Rail
Enhance your AR-15 build with the 5.56/.223 20" Stainless Steel Spiral Fluted Tactical Upper Assembl..
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AR-15 5.56/.223 20" Stainless Steel Straight Fluted Upper Assembly / Mlok
AR-15 5.56/.223 20" stainless steel straight fluted tactical upper assembly. We now make these upper..
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AR-15 5.56/.223 20" Stainless Steel Tactical Upper Assembly | M-LOK | Triport Muzzle Brake
Enhance your AR-15 build with the 20" Stainless Steel Tactical Upper Assembly designed for precision..
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AR-15 5.56/.223 24" Black Nitride Spiral Bull Upper Assembly / Mlok
Maximize Precision with the AR-15 5.56/.223 24" Black Nitride Spiral Bull Upper AssemblyElevate your..
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AR-15 5.56/.223 24" stainless steel fluted bull upper assembly / Mlok
AR-15 5.56/.223 24" stainless steel fluted bull upper assembly includes: Barrel - 24" 416 stainless ..
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AR-15 5.56/.223 7" Pistol Upper Assembly / 7" M-LOK / CERAKOTE – ODG, SNIPER, FDE
Elevate your AR-15 build with the 7" Pistol Upper Assembly designed for ultimate versatility, durabi..
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AR-15 5.56/.223 7.5" Pistol Upper Assembly - Titanium Blue - Fake Can
BARREL - 7.5" 5.56 NATO M4 CONTOUR 41V50 CMV BARREL, NITRIDE COATED. HEAT TREATED TO RC 28-32 A..
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AR-15 5.56/.223 7.5" Pistol Upper Assembly / Blue / Fake Suppressor
AR-15 5.56/.223 7.5" Pistol Upper Assembly / Blue / Fake Suppressor is a perfect addition to your AR..
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AR-15 5.56/.223 7.5" Pistol Upper with 7" M-LOK Handguard and Triport Muzzle Brake – 1:7 Twist, Nitride Barrel
Experience compact firepower with the AR-15 7.5" Pistol Upper Assembly, engineered for close-quarter..
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AR-15 5.56/.223 Wylde 16" M-Lok Handguard Upper Assembly, Side Charger
This AR-15 5.56/.223 Wylde 16" M-Lok Upper Assembly is built for performance and versatility. It fea..
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AR-15 5.56/.223 Wylde 16" Stainless Black Claw Premium Upper Assembly – MLOK
The AR-15 5.56/.223 Wylde 16" Stainless Black Claw Premium Upper Assembly is engineered for performa..