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 .224 Valkyrie 20" VALKYRIE MEDIUM RIFLE LENGTH 1/7 BARREL - 4150 CMV
AR-15 .224 Valkyrie 20" VALKYRIE MEDIUM RIFLE LENGTH 1/7 BARREL - 4150 CMVLENGTH: 20"PROFILE: MEDIUM..
-20%
AR-15 .224 Valkyrie 20″ nitride upper assembly / Mlok
The Moriarti Armaments AR-15 .224 Valkyrie 20″ nitride upper assembly / Mlok comes complet..
-43%
AR-15 .224 Valkyrie 20″ stainless steel upper assembly / 15" Mlok
The Moriarti Armaments AR-15 .224 Valkyrie 20″ stainless steel upper assembly comes complete wi..
-33%
AR-15 .300 AAC Blackout 16" Barrett-Style Lightweight Upper – 15" FDE M-LOK
The Moriarti AR-15 .300 AAC Blackout 16" Barrett-Style Upper Assembly features a 16-inch 4150 Chrome..
AR-15 .300 Blackout 16" Black Wolf Stainless Upper Assembly – Fluted Barrel, 12" M-LOK
The Moriarti AR-15 .300 AAC Blackout Black Wolf Stainless Upper Assembly features a distinctive 16-i..
-25%
AR-15 .300 Blackout 16" Upper Assembly – 12" Diamond Cut M-LOK, A2 Flash Hider
The Moriarti AR-15 .300 AAC Blackout upper assembly features a 16-inch medium-profile 4150 chrome-mo..
-30%
AR-15 .300 Blackout 16" Upper Assembly – 12" Hybrid M-LOK, Tri-Port Brake
The Moriarti AR-15 .300 AAC Blackout 16" Upper Assembly features a 4150 CMV steel barrel with a nitr..
-25%
AR-15 .300 Blackout 16" Upper Assembly – 15" MOD LITE M-LOK, Tri-Port Brake
The Moriarti AR-15 .300 Blackout 16" Upper Assembly combines a medium-profile 4150 Chrome Moly Vanad..
-44%
AR-15 .300 BLK 16" PISTOL UPPER ASSEMBLY /15" MLOK / CERAKOTE & CHOOSE
The Moriarti AR-15 .300 AAC Blackout upper assembly features a 16-inch button-rifled 4150 CMV barrel..
-32%
AR-15 .338 ARC 10.5" Pistol Kit | 1:5 Twist | Slick Side | 10" Quad Rail
Build around the increasingly popular .338 ARC cartridge with this Moriarti 10.5" .338 ARC AR-15 pis..
-30%
AR-15 .350 Legend 16" Carbine Upper Assembly | 15" M-Lok Handguard | Custom Cerakote Gradient Colors | 1:16 Twist | 5/8x24 Thread
Transform your AR-15 with the Moriarti Armaments .350 Legend 16" Carbine Upper Assembly, now availab..
-33%
AR-15 .350 Legend 16" Stainless Black Claw Premium Upper Assembly / M-Lok
Elevate your AR-15 platform with the .350 Legend 16" Stainless Black Claw Premium Upper Assembly, de..
-40%
AR-15 .350 Legend 16" Stainless Steel Fluted Upper Assembly | Mlok Handguard | Carbine-Length Gas System
Take your AR-15 to the next level with the Moriarti Armaments .350 Legend 16" Stainless Steel Fluted..
-56%
AR-15 .350 Legend 16" Tactical Upper Assembly | 12" M-Lok Rail | Custom Upper | Enhanced Performance
Upgrade your AR-15 with the .350 Legend 16" Tactical Upper Assembly featuring a 12" M-Lok free float..
-33%
AR-15 .350 Legend 16" Upper Assembly | 10" Quad Rail | Custom Cerakote Color Options | 1:16 Twist | 5/8x24 Thread
Transform your AR-15 with the Moriarti Armaments .350 Legend 16" Upper Assembly, designed to deliver..
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 Parts 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 ..
-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 16" Faxon Gunner Upper Assembly – 12" M-LOK | Magnum
The Moriarti AR-15 .458 SOCOM upper assembly features a 16-inch Faxon Firearms Gunner-profile barrel..
-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..