Micro ARP Pistols & Compact AR Builds
Explore Moriarti Arms Micro ARP pistols, compact AR uppers, and short-barrel AR platform builds designed for shooters who want a smaller, maneuverable AR-style setup. This collection includes popular compact configurations in 7.62x39, 300 Blackout, 9mm, 10mm, and 5.56, with options for different barrel lengths, handguards, and build styles.
Whether you are looking for a micro AR pistol, compact PCC-style build, or short AR upper assembly, this category brings our most popular Micro ARP configurations into one easy-to-shop collection.
Looking for an ultra-compact setup? Our Micro ARP collection includes 3-inch, 4-inch, 4.5-inch, and 5-inch configurations in several calibers. These small AR-platform pistols prioritize compact dimensions while offering multiple caliber, color, and component options for different build preferences.
Read our complete Micro ARP Buyer's Guide →
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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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5" 5.56 NATO AR-15 Pistol Upper Assembly – 1:5 5R Barrel, Custom Color Accents
The Moriarti 5" 5.56 NATO AR-15 Pistol Upper Assembly features a 4150 steel barrel with black nitrid..
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5" 5.56 NATO Micro ARP Red Accent Pistol Upper Assembly with Charging Handle
The Moriarti 5" 5.56 NATO Micro ARP Red Accent Pistol Upper Assembly features a compact configuratio..
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5" 5.56 NATO Micro ARP Sidewinder Pistol Upper Assembly – M-LOK
The Moriarti 5" 5.56 NATO Micro ARP Sidewinder Pistol Upper Assembly is part of the Moriarti Micro A..
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5" 5.56 NATO Micro ARP Suppressor Ready Upper Assembly – 4" M-LOK, A2 Flash Hider
The Moriarti 5" 5.56 NATO Micro ARP Suppressor Ready Upper Assembly is part of Moriarti's Micro ARP ..
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5" AR-15 Suppressor Ready Pistol Upper Assembly – Choose Caliber & Color
The Moriarti 5" AR-15 Suppressor Ready Pistol Upper Assembly is available in 5.56 NATO, .300 AAC Bla..
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AR-10 .308 7.5" Pistol Flash Can Upper Receiver Assembly | M-LOK Handguard | Trident Flash Suppressor | DPMS Compatible
The AR-10 .308 7.5" Pistol Flash Can Upper Receiver Assembly is a high-performance, compact upper de..
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AR-10 .308 7.75" Pistol Upper Receiver Assembly – Air-Lok Series 7" MLOK Rail, Sights
Enhance your AR-10 pistol build with the AR-10 .308 7.75" Pistol Upper Receiver Assembly, featuring ..
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AR-10 8.6 Blackout 8" Pistol Flash Can Upper Receiver Mlok Assembly / Cone – DPMS Compatible
The AR-10 8.6 Blackout 8" Pistol Flash Can Upper Receiver Mlok Assembly is designed for those who de..
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AR-10mm 5.5" Slick Side Pistol Upper with Diverter, BCG & Charging Handle - Choose Color
Build your perfect AR-10mm pistol with this 5.5" Slick Side Upper in 10mm, featuring a muzzle blast ..
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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
Unleash compact performance with the Moriarti 5 Inch 300 Blackout Pistol Upper Assembly – Centurion ..
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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 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 4.5" Micro ARP Suppressor Ready Pistol Upper Assembly – Multiple Calibers & Colors
The Moriarti 4.5" Micro ARP Suppressor Ready Pistol Upper Assembly is a compact AR-platform upper of..
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AR-15 40 S&W 4" Compression Series Micro Pistol Kit – Build Your Custom Micro Pistol
Transform your shooting experience with the AR-15 40 S&W 4" Complete Compression Series Micro Pi..
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AR-15 5.56 NATO 5" BEWARE PISTOL KIT - MLOK - MICRO
Unleash your inner gunsmith with the AR-15 5.56 NATO 5" Pistol Kit, designed for performance, precis..
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AR-15 5.56 NATO 5" Micro ARP Pistol Upper | Blue Accent | CH & Can
The Moriarti AR-15 5.56 NATO 5" Pistol Upper combines compact Micro ARP styling with distinctive blu..
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AR-15 5.56 NATO 5" PISTOL KIT - SIDE CUT BILLET UPPER WITH 4" COMBAT MODULAR M-LOK HANDGUARD - BURNT BRONZE CERAKOTE ACCENTS
Build your dream AR-15 pistol with this high-performance 5.56 NATO 5" Pistol Kit, featuring side cut..
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AR-15 5.56 NATO 5" Pistol Kit - Side Cut Billet Upper with 4" Handguard | Gradient Color Option
Transform your AR-15 build with this 5.56 NATO 5" Pistol Kit, designed for superior performance and ..
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AR-15 5.56/.223 5" MICRO PISTOL KIT /4" MLOK / COLOR ACCENT CHOICE
Build Your Own Micro AR Pistol with Ease – This comprehensive kit includes everything you need to as..
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AR-15 5.56/.223 5″ Micro Pistol Kit – 1:5 Twist, Micro Buffer, 4″ M-LOK Rail, Mil-Spec Components
The AR-15 5.56/.223 5″ Micro Pistol Kit from Moriarti Armaments offers a compact and powerful AR pis..
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AR-15 7.62x39 5" COMPLETE COMPRESSION SERIES MICRO PISTOL KIT - NO LOWER - CHOOSE YOUR COLOR
Make It Fun. Make It Yours.Transform your AR-15 with the 7.62x39 Micro Pistol Kit from Moriarti Arma..
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AR-15 7.62x39 5" Moriarti Minimalist Series Semi Auto Pistol | HBPDW
AR-15 7.62x39 5" Minimalist Series Semi Auto Pistol | HBPDW Adjustable Brace. Must be transfer..
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AR-15 7.62x39 5" Pistol Hybrid Upper Assembly - Spitfire / MLOK Rail
The AR-15 7.62x39 5" Pistol Hybrid Upper Assembly with Spitfire Muzzle Brake and MLOK Rail is the pe..
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AR-15 7.62X39 5" SPIDER PISTOL KIT - FORGED UPPER WITH 4" HANDGUARD - COLOR SET
AR-15 7.62X39 5" SPIDER PISTOL KIT - FORGED UPPER WITH 4" HANDGUARD - COLOR SETBuild Your Own High-P..
AR-40 4" Slick Side LRBHO Pistol Upper with BCG - .40 S&W | Moriarti Armaments
The AR-40 4" Slick Side LRBHO Pistol Cone Complete Upper Assembly with BCG in .40 S&W is the per..
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AR-40 4" Slick Side Pistol Upper with Diverter, BCG & Charging Handle - Choose Color
Build your perfect AR-40 pistol with this 4" Slick Side Upper in .40 S&W, featuring a muzzle bla..
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AR-40 4" Slick Side Pistol Upper | .40 S&W | Flash Can, BCG & Charging Handle, Non-LRBHO
The AR-40 4" Slick Side Pistol Upper is a high-performance upper assembly chambered in .40 S&W, ..
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AR-40 40 S&W 4" Micro Pistol Build Kit – MLOK, Classic AR-15 Parts | Moriarti Armaments
The AR-40 40 S&W 4" Micro Pistol Build Kit from Moriarti Armaments is the ideal choice for those..
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AR-40 40 S&W 4" Micro Pistol Build Kit – MLOK, Spider Engraved Dust Cover | Choose Color
The AR-40 40 S&W 4" Micro Pistol Build Kit from Moriarti Armaments offers all the essential comp..
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AR-45 .45 ACP 4" Slick Side Complete Upper / LRBHO / BCG and Charging Handle – Moriarti Armaments
Experience smooth cycling and compact firepower with Moriarti Armaments' AR-45 .45 ACP 4" Slick Side..
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AR-45 .45 ACP 4" Slick Side Cone Upper / BCG and Charging Handle / Non-LRBHO – Moriarti Armaments
The AR-45 .45 ACP 4" Slick Side Cone Upper from Moriarti Armaments is engineered for compact .45 ACP..
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AR-45 .45 ACP 4" Tactical Upper Assembly / Slick / American Flag Charging Handle / Non-LRBHO
AR-45 .45 ACP 4" Tactical Upper Assembly / American Flag Charging Handle / Non-LRBHO from Mori..
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AR-47 7.62x39 5" Cookie Cutter Upper Assembly / Mlok
Upgrade your rifle with the AR-47 7.62x39 5" Cookie Cutter Upper Assembly, featuring a Micro Length ..
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AR-47 7.62x39 5" Moriarti Micro Mini Series Semi-Auto Pistol | Color Option - Blue, FDE, ODG, Grey
The most popular pistol, Moriarti 5" Micro Mini Series Semi-Auto Pistol, is now available in co..
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AR-9 9MM 4.5" Mini Pistol Build Kit w/ SBA3 Brace - M-Lok / Non-LRBHO
AR-9 9MM 4.5" Mini Pistol Build Kit w/ SBA3 Brace - M-Lok / Non-LRBHOBuild your custom AR-9 9MM pist..
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ARP 9MM 3" Micro Complete Upper | AR-9 Pistol Upper | M-LOK | Moriarti Armaments
Experience maximum compactness with the Moriarti ARP 9MM 3" Micro Complete Upper Assembly. Designed..
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ARP-10 .308 Winchester 7.75" High Power Tactical Pistol Kit | Micro AR Pistol | SBA3 | M-LOK | DPMS Compatible | Moriarti Armaments
Experience the power of .308 Winchester in a compact ARP-10 platform with the Moriarti ARP-10 7.75" ..
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ARP-10 6.5 Creedmoor 7.5" Hybrid Complete Upper Assembly | Pistol Gas | Shroud | Moriarti Armaments
Upgrade your AR-10 project with the ARP-10 6.5 Creedmoor 7.5" Hybrid Upper Receiver Assembly, design..
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ARP-10 8.6 Blackout 8" Tactical Mini Pistol | DPMS Pattern | M-LOK | Moriarti Armaments
Experience uncompromising power in a compact package with the Moriarti ARP-10 8.6 Blackout 8" Tactic..
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MA-10 .308 WIN MORIARTI 7.5" PISTOL / CHOOSE YOUR CERAKOTE COLOR / SUPPRESSOR READY
Crafted for the discerning shooter, the MA-10 .308 Win Moriarti 7.5" Pistol delivers outstanding pow..
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MA-9 9MM 4.5" Micro ARP Pistol – Glock Style | SBR Ready | Color Choice
The Moriarti MA-9 9MM 4.5" Micro ARP Pistol delivers an ultra-compact 9mm AR-platform configuration ..