300 AAC Blackout

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 14.5" Blackout Ballistic Advantage keymod tactical pistol kit
    AR-15 300 AAC 14.5" Blackout Ballistic Advantage keymod tactical pistol kit. This kit contains all components to complete your AR-15 300 BLK build. The kit comes WITHOUT 80% lower receiver. All options and modifications to your kit are available on top of this page.  All components are Mil Spec..
    AR-15 300 AAC 14.5" Blackout Ballistic Advantage keymod tactical pi...
    $429.95$549.95
  • 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 -is a perfect addition to your AR-15 build. All you need is a case of ammo to change your standard AR 5.56 to a new 300 Blackout upper.Assembly Features:Chamber - 300 AACBarrel Twist - 1x7Barrel Thread -..
    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" KEYMOD UPPER ASSEMBLY WITH FLASH CONE
    AR-15 300 AAC BLK 7.5" KEYMOD UPPER ASSEMBLY WITH FLASH CONEAction: 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 M4 hbar contour, phosphate finish, heat tr..
    AR-15 300 AAC BLK 7.5" KEYMOD UPPER ASSEMBLY WITH FLASH CONEAction:...
    $249.95$349.95
  • AR-15 300AAC 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...
    $269.95$399.95
  • AR-15 300AAC Blackout 16" Spiral "Black Shark" Upper Assembly
    AR-15 300AAC Blackout 16" Spiral "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, 4150V..
    AR-15 300AAC Blackout 16" Spiral "Black Shark" Upper Assembly. Crea...
    $269.95$399.95
  • AR 5.5" FAKE SUPPRESSOR, 5/8x24
    AR 5.5" FAKE SUPPRESSOR, 5/8x24T6 AluminumUS Made5.5 " Total Length5/8 x 24 ThreadExtends Barrel Length 5.5 InchesLaser Engraved With Military Style Markings300 AAC/ .308 Cal / 7.62x39 ..
    AR 5.5" FAKE SUPPRESSOR, 5/8x24T6 AluminumUS Made5.5 " Total Length...
    $49.95
  • AR GEN 2 NITRIDE STEEL MULTI PORT COMPENSATOR, 5/8x24 (AR-10, 300BLK, 7.62X39)
    Multi Port CompensatorFlat side, tanker style3 Side Porting Slots and 2 Top Porting Holes To Reduce Muzzle Climb And RecoilCrush Washer IncludedAll Steel Construction, Black Nitride Coated.308 Cal / 300 AAC Blackout / 7.62x395/8 x 24 ThreadsUSA made ..
    Multi Port CompensatorFlat side, tanker style3 Side Porting Slots a...
    $89.95
  • AR GEN 2 STAINLESS STEEL MULTI PORT COMPENSATOR, 5/8x24 (AR-10, 300BLK, 7.62X39)
    AR GEN 2 STAINLESS STEEL MULTI PORT COMPENSATOR, 5/8x24 (AR-10, 300BLK, 7.62X39)Multi Port CompensatorFlat side, tanker style3 Side Porting Slots and 2 Top Porting Holes To Reduce Muzzle Climb And RecoilCrush Washer IncludedAll Steel Construction, Stainless Steel.308 Cal / 300 AAC Blackout / 7.62x39..
    AR GEN 2 STAINLESS STEEL MULTI PORT COMPENSATOR, 5/8x24 (AR-10, 300...
    $89.95
  • AR Noveske KX5 Flash Suppressor Pig Black 5/8x24
    AR 5/8x24 Noveske KX5 Flash Suppressor Pig Black. Made in Grants Pass,Oregon USA. Heat-Treated CM Construction  Nitride Finish  4.5 ounces  1.2 inch Dia  3.25 inch OAL  This KX5 may be used on:  .308, 300 BLK, 6.8 SPC, 7.62mm = 5/8x24 The Noveske KX5..
    AR 5/8x24 Noveske KX5 Flash Suppressor Pig Black. Made in Grants Pa...
    $169.95
  • AR SlimLine MicroCone Flash 5/8x24
    AR SlimLine MicroCone Flash 5/8x24Solid T6 Aluminum Body 5/8 x 24 Thread .308/ 300 AAC Blackout Cal Pushes Flash Forward Micro VersionMade in USA ..
    AR SlimLine MicroCone Flash 5/8x24Solid T6 Aluminum Body 5/8 x...
    $49.95
  • AR-15 16" 300 AAC BLACKOUT NITRIDE 15" LIGHTWEIGHT KEYMOD 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...
    $269.95$329.95
  • 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...
    $249.95$349.95
  • AR-15 300 AAC 7.5" stainless steel blackout pistol barrel 1-7 twist
    AR-15 300 AAC 7.5" stainless steel blackout pistol barrel 1-7 twist. Made from 416 stainless steel hardened to 26-32 rc and stress relieved. 1-9 rh twist. 6 groove button rifled. Chambered in 5.56 nato (also accepts .223 rounds). .750"diameter under gas block. Standard 1/2-28 thread for..
    AR-15 300 AAC 7.5" stainless steel blackout pistol barrel 1-7 twist...
    $99.95$149.95
  • AR-15 300 AAC blackout 10.5" hbar barrel 1-8 twist
    AR-15 300 AAC blackout 10.5" hbar barrel 1-8 twist. Made from 4150; parkerized finish. Chambered 300 aac blackout 10.5" 1-8 rh twist button rifled Carbine length gas system .750 gas block diameter 5/8-24 threads on muzzle end (the same as for .308 barrels) ..
    AR-15 300 AAC blackout 10.5" hbar barrel 1-8 twist. Made from 4150;...
    $99.99$149.95
  • AR-15 300 AAC Blackout 10.5" keymod tactical premium pistol kit
    AR-15 300 AAC Blackout 10.5" keymod tactical premium pistol kit contains all components to complete your AR-15. The kit comes WITHOUT 80% stripped lower receiver. All options and modifications to your kit are available on top of this page. Upper and 80% Stripped Lower are made from 70..
    AR-15 300 AAC Blackout 10.5" keymod tactical premium pistol ki...
    $389.95$529.95
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  • AR-15 300 AAC blackout 10.5" nitride classic keymod upper assembly
    AR-15 300 AAC blackout 10.5" classic keymod 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" heavy co..
    AR-15 300 AAC blackout 10.5" classic keymod upper assembly is a per...
    $269.95$399.95
  • AR-15 300 AAC blackout 16" M4 classic tactical rifle kit
    AR-15 300 AAC 16" blackout M4 classic tactical rifle kit, AR-15 Mil Spec Lower Parts Kit. This rifle kit contains all components to complete your AR-15 Rifle. The rifle kit comes WITHOUT 80% lower receiver. All options and modifications to your kit are available on top of this page. All co..
    AR-15 300 AAC 16" blackout M4 classic tactical rifle kit, AR-1...
    $329.95$499.95
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  • AR-15 300 AAC blackout 16" stainless steel "Eagle Claw" complete upper assembly
    AR-15 300 AAC blackout 16" stainless steel "Eagle Claw" 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 bar..
    AR-15 300 AAC blackout 16" stainless steel "Eagle Claw" complete up...
    $399.95$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 contour barr..
    AR-15 300 AAC blackout 16" stainless steel black diamond fluted upp...
    $399.99$449.95
  • 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 hbar contour barrel. Hardened to 26..
    AR-15 300 AAC 16" BLACKOUT STAINLESS STEEL DIAMOND FLUTED UPPER ASS...
    $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 releived. ..
    AR-15 300 AAC Blackout 16" stainless steel spiral fluted tacti...
    $449.95$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...
    $349.99$399.95
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  • AR-15 300 AAC Blackout 7.5" Pistol Build Kit w/ 4.5" M-Lok & Shockwave
    AR-15 300 AAC Blackout 7.5" Pistol Build Kit w/ 4.5" M-Lok & Shockwave. This kit contains all components to complete your AR-15 project. The kit comes WITH 80% stripped lower receiver. All options and modifications to your kit are available on top of this page. All components are Mil S..
    AR-15 300 AAC Blackout 7.5" Pistol Build Kit w/ 4.5" M-Lok & Sh...
    $449.95$599.95
  • AR-15 300 AAC Blackout 7.5" tactical pistol kit
    AR-15 300 AAC Blackout 7.5" tactical pistol kit. This kit contains all components to complete your AR-15 project. The kit comes WITHOUT 80% stripped lower receiver. All options and modifications to your kit are available on top of this page. All components are Mil Spec and made in the USA. ..
    AR-15 300 AAC Blackout 7.5" tactical pistol kit. This kit contains ...
    $329.95$479.95
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  • AR-15 300 AAC Blackout 9" 4150 CMV  barrel 1-7 twist
    AR-15 300 AAC Blackout 9" 4150 CMV  barrel 1-7 twist MADE FROM 4150 CMV AND HARDENED TO 26-32 RC AND STRESS RELIEVED, PLATED BLACK.  1-7 RH TWIST CHAMBERED IN 300 AAC BLACKOUT .750"DIAMETER UNDER GAS BLOCK CARBINE LENGTH GAS SYSTEM 5/8-24 THREAD FOR ATTACHING MUZZLE D..
    AR-15 300 AAC Blackout 9" 4150 CMV  barrel 1-7 twist MADE FR...
    $154.95