Carbine / Rifle Length

From its humble origins in the U.S. military, the 300 Blackout has grown in popularity as more customers recognize its versatility and extreme performance. Moriarti Arms ® offers a wide variety of AR builds, assemblies, parts and more, chambered in the versatile 300 blackout cartridge

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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 . CA and NY compliant.Action: Semi-autoGas System: Pistol Length Gas SystemChamber: 300 BlackoutTwist Rate: 1/8 button rifledBarrel: 16" heavy barrel, 4150V steel, chrome moly, heat treated, black, M4 ..
    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: 1/8 button rifledBarrel: 16" heavy barrel, 4150V steel, chrome moly, heat treated, black, M4 ..
    AR-15 300 AAC Blackout 16" Carbine "CLAW" UPPER ASSEMBLY / MLOK&nbs...
    $269.95$399.95
  • AR-15 300 AAC Blackout 16" Diamond "Predator" Upper Assembly
    AR-15 300AAC Blackout 16" Diamond "Predator" Upper Assembly. Created by Moriarti Armaments. CA and NY compliant.Action: Semi-auto Gas System: Carbine Length Gas System Chamber: 300 Blackout Twist Rate: 1/8 button rifled Barrel: 16" heavy barrel, 4150V s..
    AR-15 300AAC Blackout 16" Diamond "Predator" Upper Assembly. Create...
    $399.95
  • AR-15 300 AAC Blackout 16" Fluted "Black Shark" Upper Assembly
    AR-15 300AAC Blackout 16" Fluted "Black Shark" Upper Assembly. Created by Moriarti Armaments. CA and NY compliant. Action: Semi-auto Gas System: Carbine Length Gas System Chamber: 300 Blackout Twist Rate: 1/8 button rifled Barrel: 16" heavy barrel,..
    AR-15 300AAC Blackout 16" Fluted "Black Shark" Upper Assembly. Crea...
    $399.95
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  • AR .300 BLK 16" PISTOL LENGTH 1:8 TWIST / 12" MLOK / TRIPORT
    Barrel Length: 16"Gas System: PistolBarrel Steel: 4150V Chrome Moly VanadiumBarrel Finish: PhosphateMuzzle Thread: 5/8-24Chamber: 300 BlackoutTwist Rate: 1 in 8"Barrel Extension: M4Diameter at Gas Block: .750"Gas Block Type: Low-profile steelMuzzle Device: Triport Muzzle BrakeReceiver Material: Forg..
    Barrel Length: 16"Gas System: PistolBarrel Steel: 4150V Chrome Moly...
    $229.95$349.95
  • 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: CarbineBarrel Steel: 4150V Chrome Moly VanadiumBarrel Finish: NitrideMuzzle Thread: 5/8-24Chamber: 300 BlackoutTwist Rate: 1 in 8"Barrel Extension: M4Diame..
    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$369.95
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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...
    $349.95
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  • AR-15 300 AAC 16" MLOK UPPER ASSEMBLY WITH 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: 1/8, 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 16" pistol length upper assembly w/ 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...
    $249.95$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 steel "Black Wolf" complete 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 contour barrel...
    AR-15 300 AAC blackout 16" stainless steel "Black Wolf" complete up...
    $299.95$429.95
  • AR-15 300 AAC blackout 16" stainless steel black diamond fluted 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...
    $399.95$499.95
  • 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 to buy 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...
    $399.95$499.95
  • AR-15 300 AAC Blackout 16" stainless steel spiral fluted tactical upper assembly
    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. The upper features:Barrel - 16" 416 stainless steel hbar contour barrel with x-treme spiral fluting. Hardened to 26-32 rc and stress relived.  ..
    AR-15 300 AAC Blackout 16" stainless steel spiral fluted tacti...
    $399.95$499.95
  • AR-15 300 AAC blackout 16" stainless straight fluted tactical upper assembly
    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 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 300BLK 16" STAINLESS BLACK CLAW PREMIUM UPPER ASSEMBLY / MLOK
    AR-15 300BLK 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, 1-8 rh twist. Bear Claw spiral flutes. Button rifled. .750 under gas block. 5/8-24 threads. Barrel is ..
    AR-15 300BLK 16" STAINLESS BLACK CLAW PREMIUM UPPER ASSEMBLY / MLOK...
    $299.95$399.95
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