Micro ARP 300 Blackout
Micro ARP 300 Blackout builds are designed to deliver exceptional performance from compact AR platforms. The 300 BLK cartridge was specifically developed for short barrels, making it one of the most popular choices for Micro ARP pistols, uppers, and custom builds.
Whether you're building a compact range firearm, home-defense platform, or suppressor-ready setup, 300 Blackout provides excellent energy, versatility, and reliability in short-barrel configurations.
Browse our selection of Micro ARP 300 BLK pistols, uppers, barrels, and components engineered for compact performance.
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5" 300 Blackout Upper Assembly – AR-15 Pistol Upper with American Flag Engraving & Shark Muzzle Brake | Moriarti Armaments
Upgrade your AR-15 platform with the Moriarti 5 Inch 300 Blackout Upper Assembly, designed for shoot..
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AR-15 .300 Blackout 5" Micro Mini Pistol | Red Accents & Honey Badger Brace
The AR-15 MORIARTI .300 Blackout 5" Semi Auto Pistol offers a compact, high-performance package tail..
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AR-15 .300 Blackout 5" Micro Pistol Kit / 1:7 Twist / Micro Buffer / 4" M-LOK Rail
The Moriarti AR-15 .300 AAC Blackout 5" Micro Pistol Kit is a compact and powerful option for shoote..
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AR-15 300 Blackout 5" Centurion Upper Assembly / MLOK – Choose Handguard Color
5 Inch 300 Blackout Pistol Upper – Centurion M-LOK EditionUnleash compact performance with the Moria..
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AR-15 300 Blackout 5" Micro Upper Assembly / Sound Forwarder / Mlok / 1x7
Upgrade your AR-15 build with this 300 Blackout 5" Nitride Upper Assembly from Moriarti Armaments, d..
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AR-15 300 Blackout 5" PISTOL BILLET UPPER / 4'' MLOK / GOLD MUZZLE / CH
AR-15 300 Blackout 5" PISTOL BILLET UPPER / 4'' MLOK / GOLD MUZZLE BRAKE FEATURES:300 Blackout 5 Inc..
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AR-15 300 Blackout 5" Shark Pistol Kit - Side Cut Billet Upper with 4" Handguard - Classic Mini
AR-15 300 Blackout 5" Shark Pistol Kit - Side Cut Billet Upper with 4" Handguard - Classic Mini Unl..
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AR-15 300 BLACKOUT 5" SPIDER PISTOL KIT - FORGED UPPER WITH 4" HANDGUARD - COLOR SET
AR-15 300 BLACKOUT 5" SPIDER PISTOL KIT - FORGED UPPER WITH 4" HANDGUARD - COLOR SETBuild Your Own H..
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AR-15 300 BLACKOUT 5'' PISTOL BILLET UPPER / CH / 4'' MLOK / STAY SPOOKY- COLOR SET
Moriarti Armaments introduces the Stay Spooky 300 Blackout Pistol Upper, a compact, lightweight, and..
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AR-15 300 Blackout 5'' Pistol Kit - Side Cut Billet Upper, 4'' Super Slim Handguard, 'Stay Spooky' Skull Dust Cover - Color Set Options
AR-15 300 Blackout 5'' Pistol Kit - Side Cut Billet Upper, 4'' Super Slim Handguard, 'Stay Spooky' S..
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AR-15 300 BLK 5" Pistol Upper Assembly - Gold Spitfire / Mlok
Unleash precision, power, and performance with the AR-15 300 Blackout 5" Pistol Upper Assembly featu..
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AR-15 300 BLK 5'' PISTOL KIT - BILLET UPPER / 4'' HANDGUARD / CERAKOTE SPLATTER - CHOOSE COLOR
AVAILABLE IN PINK, TIFFANY BLUE, WHITE, RED AND ORANGE. CHOOSE YOUR PREFERENCE ON TOP OF PAGE.KIT IN..
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AR-15 300AAC Blackout Moriarti Arms 5" Semi Auto Mini Pistol | Honey Badger PDW Brace | Shroud
Introducing the AR-15 300AAC Blackout Moriarti Arms 5" Semi Auto Mini Pistol, built for those seekin..
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AR-15 4.5" Micro APR Suppressor Ready Pistol Upper Assembly – Choose Caliber & Color
The AR-15 4.5" Micro APR Suppressor Ready Pistol Upper Assembly is a compact, high-performance upper..
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AR-15 4.5" Micro ARP Pistol Upper Assembly / Mini Can - Caliber Choice
The AR-15 4.5" Micro ARP Pistol Upper Assembly with Mini Can - Caliber Choice is designed to de..
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AR-15 5" Pistol Upper Assembly | Suppressor Ready | Choose Caliber & Color
Unlock precision, power, and reliability with the AR-15 5" Pistol Upper Assembly, equipped with M-LO..
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ARP-15 5" Cookie Semi-Auto Pistol | SBA3 Brace | Choose Caliber | Moriarti Armaments
Experience compact performance with the MA-15 Moriarti 5" Cookie Semi-Auto Pistol, an ultra-compact ..
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MA-15 Moriarti 5" Spitfire Micro Mini Semi Auto Pistol | SBA3 | Multiple Calibers
The MA-15 Moriarti 5" Spitfire Micro Mini Semi Auto Pistol is a compact powerhouse that offers excep..
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Micro ARP 300 Blackout 5" Complete Upper Assembly | AR-15 Pistol Upper | Suppressor Ready | Moriarti Armaments
The Moriarti Micro ARP 300 Blackout Upper Assembly is designed for shooters looking for a compact, v..
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Micro ARP AR-15 300 Blackout 5" Hybrid Complete Upper Assembly | Spitfire Flash Can | M-LOK | Moriarti Armaments
Build the ultimate Micro ARP with the Moriarti AR-15 300 Blackout 5" Hybrid Complete Upper Assembly...
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Micro ARP AR-15 300 Blackout 5" Semi-Auto Pistol | Ergo Grip | Micro Buffer | Moriarti Micro Mini Series
Experience the next evolution of the Micro ARP with the Moriarti AR-15 300 Blackout 5" Micro Mini Se..
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Micro ARP MA-15 4.5" Semi-Auto Pistol | SBR Ready | Choose Color & Caliber | Moriarti Armaments
The MA-15 Micro ARP 4.5" Semi-Auto Pistol from Moriarti Armaments is engineered for shooters who dem..
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Moriarti Armaments AR-15 300 Blackout 5" Cookie Cutter Upper Assembly
Elevate your shooting experience with the Moriarti Armaments 300 Blackout 5" Cookie Cutter Upper Ass..
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Moriarti MA-15 5" Micro ARP Pistol | Mil-Spec Buffer | SBR Ready | Choose Caliber & Color
The Moriarti Micro ARP AR-15 5" Semi-Auto Pistol is built for shooters who demand premium performanc..
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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 | A2 Flash HiderFeatures:Premium B..
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Micro ARP MA-15 5" Semi-Auto Pistol | Classic Series | Choose Caliber | Moriarti Armaments
Experience premium performance in a compact package with the MA-15 Moriarti 5" Micro ARP Classic Sem..
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AR-15 300 BLK 5" Complete Compression Series Micro Pistol Kit – Customize Your Build with Your Personal Color
AR-15 300 BLK 5" Complete Compression Series Micro Pistol Kit – Customize Your Build Make it fun. M..