AR-15 Parts, Rifles, Uppers & Accessories
AR-15 Rifles, Kits & Gun Accessories
Welcome to the AR-15 hub at Moriarti Armaments—your one-stop destination for AR-15 rifles, pistols, upper assemblies, complete lowers, parts, kits, barrels, triggers, handguards, magazines, optics, and accessories. Whether you're building a custom rifle, upgrading an existing firearm, or replacing worn components, you'll find quality products engineered for reliability and performance. Browse complete AR-15 solutions and individual components for popular calibers including 5.56 NATO, .223 Wylde, 300 AAC Blackout, 7.62x39, 6.5 Grendel, 6MM ARC, .224 Valkyrie, .350 Legend, .400 Legend, .450 Bushmaster, .458 SOCOM, .50 Beowulf, 12.7x42, and more.
Why is the AR-15 platform so popular?
The AR-15 platform is popular because of its modular design, broad parts availability, caliber selection, and ability to support many different configurations. AR-15-style firearms can be configured for cartridges including 5.56 NATO/.223 Remington, 300 Blackout, 6.5 Grendel, 6.8 SPC II, 7.62x39, .350 Legend, .400 Legend, .450 Bushmaster, .50 Beowulf/12.7x42, and .338 ARC, depending on the components used. Shooters can also choose among different barrel lengths, handguards, stocks or pistol configurations, triggers, optics, and finishes.
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AR-15 .400 Legend 16" Barrel | 1:16 Twist | Carbine Gas
Configure a .400 Legend AR-15 rifle around this 16" .400 Legend barrel, manufactured from durable 41..
AR-15 .400 Legend 18" Barrel | 1:16 Twist | Carbine Gas
Built for a longer .400 Legend AR-15 rifle configuration, this 18" .400 Legend barrel combines a med..
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AR-15 .450 Bushmaster / .458 SOCOM Complete Bolt Assembly – Parkerized | MPI Inspected
Complete AR-15 bolt assembly for .450 Bushmaster and .458 SOCOM configurations. The assembly comes w..
-29%
AR-15 .450 Bushmaster 10.5" Pistol Build Kit | SBA3, No Lower | Moriarti Armaments
Unleash the power of the .450 Bushmaster in an AR-15 pistol configuration with the 10.5" AR-15 .450 ..
-40%
AR-15 .450 Bushmaster 10.5" Pistol Upper Assembly - Magnum Linear Comp, MLOK Rail
The AR-15 .450 Bushmaster 10.5" Pistol Upper Assembly is a custom-made, high-performance upper desig..
-38%
AR-15 .450 Bushmaster 16" Stainless Upper Assembly / Afterburner / Mlok
The AR-15 .450 Bushmaster 16" Stainless Upper Assembly / Afterburner / Mlok is the perfect upgrade f..
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AR-15 .450 Bushmaster 16" Steel Black Nitride Upper Assembly, Tanker Muzzle Brake, M-LOK Handguard
The AR-15 .450 Bushmaster 16" Steel Black Nitride Upper Assembly is a powerful and durable upgrade f..
-37%
AR-15 .458 SOCOM / .450 BUSHMASTER Nitride Bolt Carrier Group – MPI Tested
Upgrade your big-bore AR-15 build with this robust AR-15 .458 SOCOM / .450 BUSHMASTER Bolt Carrier G..
-36%
AR-15 .458 SOCOM 10.5" Upper Assembly / 10" MLOK / Tanker
The AR-15 .458 SOCOM 10.5" Upper Assembly offers big-bore power in a compact and efficient design, p..
-50%
AR-15 .458 SOCOM 16" Black Upper Assembly | MLOK Rail | Custom Heavy Brake
The AR-15 .458 SOCOM 16" Black Upper Assembly is designed for big-bore enthusiasts who seek unparall..
-29%
AR-15 .458 SOCOM 16" Faxon Gunner Upper Build / 15" MLOK Rail / Magnum Compensator | Big Bore Performance
The AR-15 .458 SOCOM 16" Faxon Gunner Upper Build delivers exceptional big-bore power with a reliabl..
-32%
AR-15 .458 Socom 16" slim profile rifle kit / Alpha Stock / 12" Mlok
The AR-15 .458 SOCOM 16" Slim Profile Rifle Kit is designed for those seeking to build a powerful .4..
AR-15 .458 SOCOM Flat Top Upper Receiver, Stripped
Upgrade your AR-15 build with the .458 SOCOM Flat Top Upper Receiver. Designed for large-bore calibe..
AR-15 .458 SOCOM TANKER STYLE STEEL MULTI-PORT COMPENSATOR – 5/8x32
AR-15 .458 SOCOM TANKER STYLE STEEL MULTI-PORT COMPENSATOR – 5/8x32Maximize control, minimize recoil..
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AR-15 .50 Beowulf 10.5" Upper Build | 10" Slim Rail | Custom Muzzle Brake
The AR-15 .50 Beowulf 10.5" Upper Build is a powerful and versatile addition to your AR-15 platform,..
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AR-15 .50 Beowulf 12.7x42 Cal 18" Parkerized Rifle Kit / 15" MLOK / Adaptive Stock / No Lower
Unleash the power of the .50 Beowulf with the 18" Parkerized Rifle Kit from Moriarti Armaments. This..
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AR-15 .50 Beowulf 16" Black Upper Assembly | MLOK Rail | FDE
The AR-15 .50 Beowulf 16" Upper Assembly offers the power and performance of the 12.7x42 (50 Beowulf..
AR-15 .50 Beowulf Multiport Compensator | 49/64x20 Thread | Black Nitride Finish | Reduce Recoil
Optimize your AR-15 build with the .50 Beowulf Multiport Compensator. This advanced Gen 2 design fea..
AR-15 / AR-10 TANKER STYLE Steel Multi-Port Compensator | Reduce Muzzle Climb & Recoil
Upgrade your AR-15 or AR-10 with the Tanker Style Steel Multi-Port Compensator from Moriarti Armamen..
-25%
AR-15 1/2X28 7" Thread-On Fake Suppressor | T6 Aluminum | Anodized Black | Moriarti Arms
Enhance the look of your AR-15 with this 1/2X28 7" Thread-On Fake Suppressor from Moriarti Arms. Mad..
AR-15 12.7x42 18" Parkerized Heavy Barrel | 1:20 Twist | Mid-Length Gas System
Experience top-tier precision and durability with the AR-15 12.7x42 18" barrel. Made from 4150 Chrom..
-23%
AR-15 12.7x42 50B 16" Parkerized Heavy Barrel, 1:20 Twist, Carbine
Elevate your AR-15 build with the 12.7x42 16" heavy barrel, designed for precision, durability, and ..
-38%
AR-15 16" .223 Wylde Diamond Fluted Stainless Tactical Upper / MLOK / CA NY Compliant | Moriarti Arms
CURRENT ETA - 4-6 WEEKSThe AR-15 5.56/.223 16" Diamond Fluted Stainless Tactical Upper from Moriarti..
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AR-15 16" 300 AAC Blackout Pistol Length 1/8 Nitride Upper | 15" Lightweight Mlok
300 AAC Blackout uppers utilize a standard .223/5.56 bolt carrier group and magazines, eliminating t..
-38%
AR-15 16" 5.56 NATO Diamond Cut MLOK Upper / 12" Rail / 1:7 / Triport Muzzle / Black | Moriarti Arms
The MORIARTI AR-15 5.56 NATO 16" Diamond Cut MLOK Upper Assembly is a precision-engineered upgrade f..
-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..
-25%
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..
-33%
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..
-34%
AR-15 18" 6mm ARC Rifle Kit - Black | Mil-Spec, USA-Made | Moriarti Armaments
Elevate your rifle-building experience with the 18" 6mm ARC Rifle Kit from Moriarti Armaments. Desig..
-80%
AR-15 2-Piece Quad Rail Barrel Nut / Steel - Replacement for Standard AR-15 & M16 Handguards
The AR-15 2-Piece Quad Rail Barrel Nut is an essential replacement part for your 2-piece handguard s..
-45%
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..
-40%
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..
-17%
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..
-28%
AR-15 300 AAC 7.5" pistol kit - MLOK / SBA3 / SHORTIE
AR-15 300 AAC 7.5" Pistol Kit - M-LOK / SBA3 / SHORTIEBuild Your Own AR-15 Pistol – The Ultimate Cus..
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AR-15 300 AAC Blackout 10.5" 4150 CMV Barrel, 1-7 twist, Govt Profile, Nitride
MADE FROM 4150 CMV AND HARDENED TO 26-32 RC AND STRESS RELIEVED, PLATED BLACK. 1-7 RH TWIST ..
-28%
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 ..
-33%
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..
-25%
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" Complete Airlight Series Rifle Kit - Left Hand | Various Colors
The AR-15 300 Blackout 16" Complete Airlight Series Rifle Kit is designed for left-handed gun enthus..
AR-15 300 BLACKOUT 16" DIAMOND FLUTED STAINLESS STEEL BARREL, CARBINE, 1-7
AR-15 300 BLACKOUT 16" DIAMOND FLUTED STAINLESS STEEL BARREL 1-7. Made from 416 stainless steel har..
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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 Steel Diamond Fluted Upper Assembly – Left Hand / MLOK Rail
The AR-15 300 Blackout 16" Stainless Steel Diamond Fluted Upper Assembly is designed to provide high..
AR-15 300 Blackout 16" stainless steel spiral fluted barrel , 1-7 , carbine
AR-15 300 Blackout 16" stainless steel spiral fluted barrel 1-7 twist. MADE FROM 416R STAINLESS STEE..
AR-15 300 Blackout 16" Stainless Steel Straight Fluted Barrel - 1:7 Twist, Carbine Gas System
Enhance your AR-15 build with the 300 Blackout 16" stainless steel barrel, designed for superior per..
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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..