300 Blackout

Enhance the performance of your rifle with the 300 Blackout Upper series from Moriarti Armaments. Regardless of your preferred configuration, whether you fancy pistol or carbine length, our 300 BLK uppers offer unparalleled precision and reliability. Experience the accuracy and dependability of our 300 Blackout 16 Inch Upper, 300 Blackout 5.5 Inch Upper, or 300BLK 10.5 Inch Upper for superior shooting results.

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  • AR-15 300 AAC Blackout 16" Carbine "BLACK CANON" UPPER ASSEMBLY
    AR-15 300 AAC Blackout 16" Carbine "BLACK CANON" UPPER ASSEMBLY . Discover unparalleled performance with Moriarti Armaments' 300 Blackout Upper. Meticulously crafted for precision and reliability, this upper promises a powerful shooting experience like no other.CA and NY compliant.Action:&..
    AR-15 300 AAC Blackout 16" Carbine "BLACK CANON" UPPER ASSEMBLY&nbs...
    $269.95$399.95
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  • AR-15 300 AAC Blackout 16" Carbine "CLAW" UPPER ASSEMBLY / MLOK
    AR-15 300 AAC Blackout 16" Carbine "CLAW" UPPER ASSEMBLY / MLOK . CA and NY compliant.Action: Semi-autoGas System: Pistol Length Gas SystemChamber: 300 BlackoutTwist Rate: 1/7 button rifledBarrel: 16" heavy barrel, 4150V steel, chrome moly, heat treated, black, M4 feedr..
    AR-15 300 AAC Blackout 16" Carbine "CLAW" UPPER ASSEMBLY / MLOK&nbs...
    $269.95$399.95
  • AR-15 300 AAC BLK 10.5" Nitro-Met Quad Upper Assembly with Socom Style Brake
    AR-15 300 AAC BLK 10.5" Nitro-Met Quad Upper Assembly with Socom Style Brake - Experience unparalleled shooting performance with Moriarti Armaments' 300 Blackout Upper, crafted with meticulous attention to detail to ensure precision and reliability. This is the key to unlocking a truly pot..
    AR-15 300 AAC BLK 10.5" Nitro-Met Quad Upper Assembly with Socom St...
    $249.95$399.95
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  • AR-15 300 AAC BLK 7.5" Cookie Cutter Upper Assembly / Mlok
    For unparalleled shooting capability, consider Moriarti Armaments' AR-15 300 AAC BLK 7.5" Cookie Cutter Upper Assembly. With a meticulous construction emphasizing precision and reliability, this assembly is sure to deliver a powerful and satisfying shooting experience.Action: Semi-auto ..
    For unparalleled shooting capability, consider Moriarti Armaments'&...
    $299.95$399.95
  • AR-15 300 AAC BLK 7.5" MLOK UPPER ASSEMBLY / FLASH CONE /1x7 / MLOK
    AR-15 300 AAC BLK 7.5" MLOK UPPER ASSEMBLY / FLASH CONE /1x7 / MLOK FEATURESAction: Semi-auto Gas System: Pistol Length Gas System Chamber: 300 AAC Twist Rate: 1/7 Muzzle Device: Flash Cone Can    Barrel: 7.5" 300 AAC 4150 CMV med profile, nitride fi..
    AR-15 300 AAC BLK 7.5" MLOK UPPER ASSEMBLY / FLASH CONE /1x7 / MLOK...
    $249.95$399.95
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  • AR-15 300 Blackout  7.5" Pistol Zombie Slayer Upper Assembly / Mlok
    AR-15 300 Blackout 7.5" Pistol Zombie Slayer Upper Assembly / Mlok - The 300 Blackout Upper by Moriarti Armaments offers unparalleled performance, providing a powerful shooting experience. It has been meticulously crafted to ensure precision and reliability, making it the ideal choice for those..
    AR-15 300 Blackout 7.5" Pistol Zombie Slayer Upper Assembly / Mlok ...
    $249.95$349.95
  • AR-15 300 Blackout 16" Med Profile Black Shark Upper Assembly / Mlok
    AR-15 300 Blackout 16" Med Profile Black Shark Upper Assembly / Mlok. Created by Moriarti Armaments. CA and NY compliant. Action: Semi-auto Gas System: Pistol Chamber: 300 Blackout Twist Rate: 1/7 button rifled Barrel: 16" med profile barrel, 4150 CMV, heat ..
    AR-15 300 Blackout 16" Med Profile Black Shark Upper Assembly / Mlo...
    $259.95$399.95
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  • AR-15 300 Blackout 5.5" Cookie Cutter Upper Assembly / Mlok
    Experience unparalleled shooting performance with Moriarti Armaments' meticulously crafted 300 Blackout 5.5" COOKIE CUTTER UPPER ASSEMBLY. This assembly promises precision and reliability, delivering a potent shooting experience unlike any other.Action: Semi-auto Gas System: Micro Lengt..
    Experience unparalleled shooting performance with Moriarti Armament...
    $299.95$449.95
  • AR-15 300 Blackout 7.5" Mlok Upper Assembly / Blue Shroud / Blue Accents / CH
    Experience the advantages of the AR-15 300 Blackout 7.5" Mlok Upper Assembly / Blue Shroud by Moriarti Armaments.Chamber - 300 BlackoutBarrel Twist - 1x7Barrel Thread - 5/8x24Barrel Steel - 4150 Chrome Moly with Nitro-Met coating, CNC machined, M4 feedrampsMuzzle Brake -&nbs..
    Experience the advantages of the AR-15 300 Blackout 7.5" Mlok Upper...
    $289.95$449.95
  • AR-15 300 Blackout 7.5" Pistol Shark Upper Assembly /Mlok
    AR-15 300 Blackout 7.5" Pistol Shark Upper Assembly /Mlok Features:1. Barrel: The AR-15 300 Blackout 7.5 Pistol Shark Upper Assembly comes with a med profile 7.5-inch long barrel, crafted from high-quality 4150 CMV, to offer a smooth shooting experience. 2. Caliber: The upper assembly is for 300 ..
    AR-15 300 Blackout 7.5" Pistol Shark Upper Assembly /Mlok Features:...
    $239.95$349.95
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  • AR-15 300 Blackout 7.5" Slick Upper Assembly / Sound Forwarder / Mlok / 1x7
    AR-15 300 Blackout 7.5" Nitride Upper Assembly / Sound Forwarder / Mlok / 1x7. Featuring 300 Blackout barrel, government profile with 1x7 TPIPLATFORM: AR-15CHAMBER: 300 BlackoutBARREL MATERIAL: 4150 CMVBARREL LENGTH: 7.5"BARREL FINISH:  NitrideTWIST RATE: 1/7MUZZLE THREAD: 5/8X24MUZZLE DEVISE: ..
    AR-15 300 Blackout 7.5" Nitride Upper Assembly / Sound Forwarder / ...
    $269.95$449.95
  • AR-15 300 Blackout 8.5" Fear Nothing Upper Assembly / Red Claw / Mlok
    AR-15 300 Blackout 8.5" Fear Nothing Upper Assembly / Red Claw / Mlok Barrel - 8.5" 300 Blackout  Barrel Twist - 1x8 Barrel Thread - 5/8x24 Barrel Steel - 4150 Chrome Moly, CNC machined, M4 feedramps Muzzle Brake - AR-15 Claw Multiprong /ANODIZE..
    AR-15 300 Blackout 8.5" Fear Nothing Upper Assembly / Red Claw / Ml...
    $299.95$449.95
  • AR-15 300 BLK 5.5" Pistol Hybrid Upper Assembly / Cone / Mlok Rail
    The AR-15 300 BLK 5.5 Pistol Hybrid Upper Assembly with Cone and Mlok Rail is a high-quality component for firearm enthusiasts and professionals. It offers exceptional performance and durability. Features:1. Barrel: The 5.5-inch barrel length is made from Chrome Moly Vanadium (CMV), delivering ..
    The AR-15 300 BLK 5.5 Pistol Hybrid Upper Assembly with Cone and Ml...
    $259.95$399.95
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  • AR-15 300 BLK 5.5" Pistol Hybrid Upper Assembly / Spitfire/ Mlok Rail
    AR-15 300 BLK 5.5" Pistol Hybrid Upper Assembly / Spitfire/ Mlok Rail Includes: WEIGHT: 2.5 LbsOVERALL LENGTH: 15"PLATFORM: AR-15CHAMBER: 300 BLKBARREL MATERIAL: 4150 CRMOV BARREL LENGTH: 5.5"BARREL FINISH:  BLACK NITRIDETWIST RATE: 1/7MUZZLE THREAD: 5/8X34MUZZLE DEVISE: SPITFIR..
    AR-15 300 BLK 5.5" Pistol Hybrid Upper Assembly / Spitfire/ Mlok Ra...
    $299.95$449.95
  • Moriarti AR-15 300 Blackout 10.5" Diamond Cut 10" Mlok Upper Assembly / Slanted Muzzle / Sniper Grey
    AR-15 300 Blackout 10.5" Diamond Cut 10" Mlok Upper Assembly / Slanted Muzzle / 1x7Manufacturer:Moriarti ArmamentsCartridge:300 BlackoutOverall Length:19.5 inBarrel Length:10.5 inBarrel Profile:MedGas System Length:Pistol LengthBarrel Twist Rate:1-7Threads per Inch:5/8x24Handguard Type:Free-FloatMuz..
    AR-15 300 Blackout 10.5" Diamond Cut 10" Mlok Upper Assembly / Slan...
    $299.95$449.95
  • AR .300 BLK 16" PISTOL LENGTH UPPER ASSEMBLY 1:7 / 12" MLOK / TRIPORT
    With a 16 inch nitride barrel chambered in 300 blackout, this AR15 upper receiver assembly is readily attachable to any Mil-Spec lower receiver. The upper receiver is forged in the M4 flat top design, facilitating easy attachment of rifle scopes and red dot sights to the picatinny rail. A Moriarti t..
    With a 16 inch nitride barrel chambered in 300 blackout, this AR15 ...
    $249.95$399.95
  • AR-15 .300 BLK 16" PISTOL UPPER ASSEMBLY /15" MLOK / CERAKOTE & CHOOSE
    AR-15 .300 BLK 16" PISTOL LENGTH 1:8 TWIST / 15" MLOK / CERAKOTE & CHOOSE COLOR ON TOP OF PAGE. This drop-in 300 Blackout upper will attach to virtually any standard AR-15 lower assembly. Includes:Barrel - 16" 4150 CMV, 1x8 twist, pistol length gas system. Phosphate finish. Chambered in 300..
    AR-15 .300 BLK 16" PISTOL LENGTH 1:8 TWIST / 15" MLOK / CERAKOTE &a...
    $449.95
  • AR-15 16" 300 AAC BLACKOUT  BARRETT STYLE 15" LIGHTWEIGHT UPPER / FDE
    AR-15 16" 300AAC BLK  BARRETT STYLE 15" LIGHTWEIGHT FDE UPPER. WE NOW MAKE THIS ITEM WITH MLOK RAIL.  Barrel Length: 16"Gas System: PistolBarrel Steel: 4150V Chrome Moly VanadiumBarrel Finish: NitrideMuzzle Thread: 5/8-24Chamber: 300 BlackoutTwist Rate: 1 in 8"Barrel Extension: M4Diamet..
    AR-15 16" 300AAC BLK  BARRETT STYLE 15" LIGHTWEIGHT FDE UPPER....
    $299.95$399.95
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  • AR-15 16" 300 AAC BLACKOUT BARRETT STYLE 15" LIGHTWEIGHT MLOK UPPER
    AR-15 16" 300 AAC BLACKOUT PISTOL LENGTH 1/8 NITRIDE 15" LIGHTWEIGHT KEYMOD UPPER. 300 blackout caliber uppers use your standard .223/5.56 bolt carrier group and magazines. No special bolts or magazines to buy to get into a new caliber! Just drop an upper on your standard mil-spec AR-15 lower, and y..
    AR-15 16" 300 AAC BLACKOUT PISTOL LENGTH 1/8 NITRIDE 15" LIGHTWEIGH...
    $279.95$399.95
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  • AR-15 16" 300 AAC BLACKOUT STAINLESS UPPER WITH THREAD PROTECTOR
    AR-15 16" 300 AAC BLACKOUT STAINLESS UPPER WITH THREAD PROTECTOR. New by Moriarti Armaments, CA and NY compliant. 300 blackout caliber uppers use your standard .223/5.56 bolt carrier group and magazines. No special bolts or magazines to buy to get into a new caliber! Just drop an upper on your stand..
    AR-15 16" 300 AAC BLACKOUT STAINLESS UPPER WITH THREAD PROTECTOR. N...
    $399.95
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  • AR-15 300 AAC 16" MLOK UPPER ASSEMBLY / SLIP OVER BARREL SHROUD
    AR-15 300 BLACKOUT 16" MLOK UPPER ASSEMBLY WITH SLIP OVER BARREL SHROUD CA and NY compliant.Action: Semi-autoGas System: Pistol Length Gas SystemChamber: 300 AACTwist Rate: 1/7, button rifledMuzzle Device: Slip over barrel shroud with multi port muzzle brake, 5/8X24Barrel: 16"..
    AR-15 300 BLACKOUT 16" MLOK UPPER ASSEMBLY WITH SLIP OVER BARREL SH...
    $259.95$399.95
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  • AR-15 300 AAC Blackout 10.5"  pistol upper assembly / Flash Cone / Mlok
    AR-15 300 AAC blackout 10.5"  pistol upper assembly with flash coneBARREL - 10.5" 4150V NITRIDE COATED MED CONTOUR BARREL. HARDENED TO 26-32 RC AND STRESS RELIEVED.  CHAMBERED IN 300 BLACKOUT. 1/7 RH TWIST.  PISTOL GAS SYSTEM .750 UNDER GAS BLOCK. BARREL IS FINISHED OFF WITH A SL..
    AR-15 300 AAC blackout 10.5"  pistol upper assembly with flash...
    $269.95$399.95
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  • AR-15 300 AAC blackout 10.5" nitride classic mlok upper assembly / A2
    AR-15 300 AAC blackout 10.5" classic mlok upper assembly is a perfect addition to your AR pistol. No other modifications to your AR-15 is required. Uses standard AR-15 BCG. All you need is 300 BLK ammo and this upper - and you have a new AR. The 10.5" 300 BLK upper includes:Barrel - 10.5" med profil..
    AR-15 300 AAC blackout 10.5" classic mlok upper assembly is a perfe...
    $229.95$399.95
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  • AR-15 300 AAC blackout 16" pistol length upper assembly / 15" Mlok
    AR-15 300 AAC blackout 16" pistol length upper assembly w/ 15" Mlok is a perfect addition to your AR pistol. No other modifications to your AR-15 is required. Uses standard AR-15 BCG. All you need is 300 BLK ammo and this upper - and you have a new AR. Barrel - 16" heavy contour barrel 415..
    AR-15 300 AAC blackout 16" pistol length upper assembly w/ 15" Mlok...
    $259.95$349.95
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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 use your standard .223/5.56 bolt carrier group and magazines. No special bolts or magazines to buy to get into a new caliber.  Barrel - 16" 416 stainless steel hbar contour barrel. Hardened ..
    AR-15 300 AAC Blackout 16" Stainless Black Wolf Upper Assembly / Ml...
    $299.95$429.95
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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 uppers use your standard .223/5.56 bolt carrier group and magazines! No special bolts or magazines to buy to get into a new caliber.    Barrel - 16" 416 stainless steel hbar contou..
    AR-15 300 AAC blackout 16" stainless steel black diamond fluted upp...
    $349.95$549.95
  • AR-15 300 AAC BLACKOUT 16" STAINLESS STEEL DIAMOND FLUTED UPPER ASSEMBLY
    AR-15 300 AAC 16" BLACKOUT STAINLESS STEEL DIAMOND FLUTED UPPER ASSEMBLY, 300 blackout caliber uppers use your standard .223/5.56 bolt carrier group and magazines! No special bolts or magazines needed to get into a new caliber!Barrel - 16" 416 stainless steel h-bar contour barrel. Hardened to 2..
    AR-15 300 AAC 16" BLACKOUT STAINLESS STEEL DIAMOND FLUTED UPPER ASS...
    $299.95$549.95
  • 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 chamber uses AR-15/M16 BCG and standard AR-15 mags. Features include:1. 300 Blackout Chamber: A special chamber that utilizes the versatile .300 Blackout rounds. This cartridge provides a wide va..
    AR-15 300 AAC Blackout 16" stainless steel spiral fluted tacti...
    $299.95$499.95
  • AR-15 300 AAC blackout 16" stainless straight fluted tactical upper assembly / Mlok
    AR-15 300 AAC blackout 16" stainless steel straight fluted tactical upper assembly. 300 blackout caliber uppers use your standard .223/5.56 bolt carrier group and magazines. No special bolts or magazines to buy to get into a new caliber! Just drop an upper on your standard mil-spec AR-15 lower, and ..
    AR-15 300 AAC blackout 16" stainless steel straight fluted tactical...
    $299.99$399.95
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  • AR-15 300 AAC blackout 7.5" nitride upper assembly / Mlok / Multiport
    AR-15 300 AAC blackout 7.5" nitride upper assembly / Mlok / Multiport is a perfect addition to your AR pistol. No other modifications to your AR-15 is required. Uses standard AR-15 BCG. All you need is 300 BLK ammo and this upper - and you have a new AR. Barrel - 7.5" heavy contour barrel 4150 ..
    AR-15 300 AAC blackout 7.5" nitride upper assembly / Mlok / Multipo...
    $249.95$399.95
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  • AR-15 300 AAC BLK 14.5'' PISTOL UPPER ASSEMBLY / 7" FAKE SUPPRESSOR / MLOK
    AR-15 300 AAC BLK 14.5'' PISTOL UPPER ASSEMBLY / 7" FAKE SUPPRESSOR / MLOK is a perfect addition to your pistol look. Just drop this pistol upper assembly on your Mil-Spec lower receiver and enjoy the outdoors. Created by MA especially for you, all USA made. BARREL - 14.5" 41V50 CMV STEEL&nbs..
    AR-15 300 AAC BLK 14.5'' PISTOL UPPER ASSEMBLY / 7" FAKE SUPPRESSOR...
    $299.95$449.95
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  • AR-15 300 Blackout 10.5" Pistol Upper Assembly / Shroud
    AR-15 300 Blackout 10.5" Pistol Upper Assembly / Shroud is a top-of-the-line assembly designed for the AR-15 rifle platform. It features a 10.5-inch barrel that is chambered in the 300 Blackout round. This powerful cartridge is known for its efficiency and versatility, capable of delivering bot..
    AR-15 300 Blackout 10.5" Pistol Upper Assembly / Shroud is a t...
    $289.95$399.95
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  • AR-15 300 Blackout 16" Chrome Moly Upper Assembly / Blue / Triport
    AR-15 300 Blackout 16" Chrome Moly Upper Assembly / Blue / Triport - perfect upgrade for your AR-15 modern sporting rifle. Some features include:1. Lightweight semi-automatic design in anodized blue.2. 300 Blackout: The .300 Blackout, also known as 7.62×35mm is a rifle cartridge developed in th..
    AR-15 300 Blackout 16" Chrome Moly Upper Assembly / Blue / Triport ...
    $299.95$399.95
  • AR-15 300 Blackout 16" Combat Upper Assembly / 15" Mlok / Multiport
    AR-15 300 Blackout 16" Combat Upper Assembly / 15" Mlok / Multiport features:Barrel - 16" 4150 CMV hbar. Chambered in 300 Blackout. 1-8 rh twist , .750 under gas block. 5/8x24 thread. Barrel is finished off with Multiport muzzle brake, designed to reduce muzzle rise and noise. M4 feedramps. A3&nb..
    AR-15 300 Blackout 16" Combat Upper Assembly / 15" Mlok / Multiport...
    $249.95$449.95
  • 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 stainless steel contour barrel. Hardened to 26-32 rc and stress relieved. Chambered in .300 BLACKOUT AAC, 1-8 rh twist. Bear Claw spiral flutes. Button rifled. .750 under gas block. 5/8-24 threads. Barre..
    AR-15 300 BLK 16" STAINLESS BLACK CLAW PREMIUM UPPER ASSEMBLY / MLO...
    $299.95$399.95
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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 / A2Features:Barrel - 6" 4150 CMV med profile barrel, nitride finish. Chambered in 300 Blackout. 1-7 rh twist. 5/8x24 thread. .750 under gas block. Barrel is finished off with A2 flashhider in nitride and a crush washer. M4 feedr..
    AR-15 300 Blackout 6" Modular Pistol Upper Assembly / Hybrid Mlok /...
    $269.95$379.95
  • AR-15 300 BLK 10.5" Walking Dead pistol upper assembly
    AR-15 300 BLK 10.5" Walking Dead pistol upper assembly   includes:Barrel - 10.5" 4150 CMV hbar/heavy contour barrel. Hardened to 26-32 rc and stress relived.  Chambered in 300 BLK. 1-8 rh twist rate, .750 under gas block. Barrel is finished off with black walking dead compensator and ..
    AR-15 300 BLK 10.5" Walking Dead pistol upper assembly   ...
    $249.95$399.95
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  • AR-15 300 BLK 8.5" Pistol Upper Assembly / Blue Mlok / Trident Cone
    AR-15 300 BLK 8.5" Chrome Moly Upper Assembly / Blue Mlok / Trident ConeHandguard - 10" mlok slim profile forearm. Made from aircraft quality aluminum and blue hardcoat anodized.Barrel -  8.5" nitride 4150 CMV, 5/8x34 Threaded, 1x8 twist, pistol length gas system, M4 Fe..
    AR-15 300 BLK 8.5" Chrome Moly Upper Assembly / Blue Mlok / Trident...
    $249.95$499.95
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  • AR-15 9" .300 AAC BLACKOUT UPPER RECEIVER W/ 9" LIGHTWEIGHT MLOK
    AR-15 9" .300 AAC BLACKOUT UPPER RECEIVER W/ 9" LIGHTWEIGHT MLOK Barrel Length: 9" Barrel Profile: Heavy Barrel Steel: 4150 Chrome Moly Vanadium  Barrel Finish: Nitride Barrel Extension: M4 Muzzle Thread: 5/8X24 Chamber: 300 AAC Twist Rate: 1 in 8"Gas System: Pistol LengthGas Bloc..
    AR-15 9" .300 AAC BLACKOUT UPPER RECEIVER W/ 9" LIGHTWEIGHT MLOK ...
    $299.95$399.95
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  • AR-15 Moriarti Duo TakeDown 16" Carbine Upper Assembly | 5.56 Nato and 300 Blk Complete Combo
    AR-15 Moriarti Duo TakeDown 16" Carbine Upper Assembly | 5.56 Nato and 300 Blk Complete Combo - you asked and we listened! Now offering the combo set in 16" carbine set up. The Complete Combo Set allows for easy and convenient way to interchange calibers without actually detaching receivers. Compati..
    AR-15 Moriarti Duo TakeDown 16" Carbine Upper Assembly | 5.56 Nato ...
    $799.95$1,399.95
  • 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:     Moriarti Armaments Cartridge:             300 Blackout Overall Length:     27.5 in Barrel Length:     16 ..
    MORIARTI AR-15 300 BLACKOUT 16" DIAMOND CUT 12" MLOK UPPER ASSEMBLY...
    $289.95$399.95