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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MA-9 9MM 4.5" Micro Glock Style Pistol Kit - Choose Color | Non-LRBHO
MA-9 9MM 4.5" Micro Glock Style Pistol Kit - Choose Color | Non-LRBHO - Complete Your DIY 9MM Projec..
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MA-9 9MM 4.5" Mini Semi Auto Pistol | Slick Side |Classic | Glock Style
The MA-9 9MM Mini Semi Auto Pistol delivers compact power and innovative design. Built for performan..
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MA-9 9MM MORIARTI 4.5" ENHANCED SPORTING MINI GLOCK STYLE PISTOL - NON-LRBHO, SBA3
FFL Transfer RequiredThe MA-9 9MM 4.5" Enhanced Sporting Mini Glock Style Pistol offers exceptional ..
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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 AR-15 5.56 NATO 5" Complete Upper Assembly | Gold Spitfire QD Blast | M-LOK | Moriarti Armaments
Stand out with the Moriarti Micro ARP AR-15 5.56 NATO 5" Complete Upper Assembly, featuring an eye-c..
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Micro ARP AR-15 5.56 NATO 5" Complete Upper Assembly | Suppressor Ready | Moriarti Armaments
The MORIARTI ARP-15 5.56 NATO 5" Pistol Upper Assembly is precision-engineered for superior performa..
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Micro ARP AR-15 5.56 NATO 5" Hybrid Complete Upper Assembly | Spitfire QD Blast | M-LOK | Moriarti Armaments
Take your next Micro ARP build to the next level with the Moriarti AR-15 5.56 NATO 5" Hybrid Complet..
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Micro ARP AR-74 7.62x39 5" Complete Upper Assembly | Suppressor Ready | Moriarti Armaments
The MORIARTI ARP-74 7.62x39 5" Micro Pistol Upper Assembly delivers compact power and versatility fo..
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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 AR-10 .308 7.5" Hybrid Upper Receiver Assembly – MLOK / Shroud
Upgrade your AR-10 project with the AR-10 .308 7.5" Hybrid Upper Receiver Assembly, designed for sho..
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Moriarti AR-10 8" 8.6 Blackout Big Gunner Upper Assembly / Muzzlok
Moriarti AR-10 8" 8.6 Blackout Big Gunner Upper Assembly with Muzzlok is a perfect addition to your ..
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Moriarti AR-10 8.6 Blackout 8" Hybrid Upper – M-LOK, Shroud, Big Bore Build
Enhance your shooting experience with the AR-10 8.6 BLACKOUT 8" Hybrid Upper Receiver Assembly, desi..
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Moriarti AR-10MM 5.5" Slick Side Micro Pistol Complete Upper / Shroud / BCG & Charging Handle - Non-LRBHO
Key Features5.5-inch 10mm barrel, 4150 CrMoV steel, nitride finish, 1:16 twist, 5/8x24 thread pitch5..
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Moriarti AR-47 7.62x39 5" Moriarti Minimalist Series Semi Auto Pistol | Ergo | Micro Buffer
The AR-47 Minimalist Series Pistol by Moriarti Arms delivers a compact, rugged, and powerful platfor..
-600x600-600x600%20(1)-228x228.webp "Moriarti AR-9 4.5\" Pistol Upper Assembly with Flash Can, BCG, and Charging Handle - Non-LRBHO")
-228x228.webp "Moriarti AR-9 4.5\" Pistol Upper Assembly with Flash Can, BCG, and Charging Handle - Non-LRBHO")
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Moriarti AR-9 4.5" Pistol Upper Assembly with Flash Can, BCG, and Charging Handle - Non-LRBHO
The AR-9 4.5" Pistol Upper is designed for compact performance and reliable operation in your 9mm AR..
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MORIARTI AR-9 9MM 4.5" DIAMOND CUT 4" MLOK UPPER ASSEMBLY / MULTIPORT / CH
The Moriarti AR-9 9mm 4.5 Diamond Cut 4 M-Lok Upper Assembly with a multiport feature, including an ..
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Moriarti AR-9 9MM 4.5" Pistol Upper Assembly with BCG and Charging Handle - Slick, Non-LRBHO
The AR-9 9mm 4.5" Pistol Upper Assembly delivers outstanding performance and versatility in a compa..
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Moriarti AR-9 9MM 4.5" Slick Side Micro Pistol Upper / Shroud / BCG & Charging Handle - Non-LRBHO
Upgrade your AR-9 pistol build with the AR-9 9MM 4.5" Slick Side Micro Pistol Upper. This complete u..
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MORIARTI AR-9 9MM 4.5" SLICK SIDE PISTOL UPPER ASSEMBLY /7" FAKE CAN / BCG & CH / NON LRBHO
The AR-9 9mm 4.5 Slick Side Pistol Upper Assembly with a 7 inch Fake Can, including BCG (Bolt Carrie..
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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 Arms MA-45 4" Micro Glock-Style Pistol | SBR Ready |Custom Color Options, Non-LRBHO
The Moriarti Arms MA-45 4" Micro Glock-Style Pistol brings superior performance and customization to..
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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-10MM 5.5" Micro ARP 10mm AR-15 Pistol Kit /Slick / Suppressor Ready
This Micro ARP 10mm AR-15 Pistol Build Kit is configured for the SBR Ready designation. The kit cent..
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AR-10MM 5.5" MLOK COMPLETE PISTOL KIT /SLICK SIDE / NON-LRBHO
Moriarti Arms, Blow Back, 10MM, 5.5" Barrel, Black Finish, Slick side upper, Non-LRBHO, Mlok, Glock ..
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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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AR-15 5" 5.56 NATO PISTOL KIT / MLOK / CERAKOTE ACCENT / CLASSIC
AR-15 5" 5.56 NATO PISTOL KIT / MLOK / CERAKOTE ACCENT / CLASSIC. The kit comes WITHOUT 8..
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AR-15 5.56 NATO 5" Micro ARP Upper | Cookie Cutter | M-LOK | Moriarti
The Moriarti AR-15 5.56 NATO 5" Cookie Cutter Upper Assembly combines aggressive styling with an ult..
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AR-15 5.56 NATO 5" Moriarti Micro Mini Series Semi-Auto Pistol | Ergo Grip | Micro Buffer
The AR-15 5.56 NATO 5" Moriarti Micro Mini Series Semi-Auto Pistol is engineered for those who appre..
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AR-15 5.56 NATO 5" Pistol Kit - Forged Upper, 4" M-LOK, Choose Your Accent Color: Blue, Silver, or Gold
Build your dream AR-15 pistol with this 5.56 NATO 5" Pistol Kit, designed for ultimate performance a..
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AR-15 5.56 NATO 5'' PISTOL UPPER ASSEMBLY / BILLET UPPER / GOLD MUZZLE BRAKE
AR-15 5.56 NATO 5'' PISTOL UPPER ASSEMBLY / BILLET UPPER / GOLD MUZZLE BRAKE FEATURES: Chamber:&n..
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AR-15 5.56 NATO 5'' SLICK BILLET UPPER ASSEMBLY / 4'' MLOK / SHARK / FLAG DC and CH
AR-15 5.56 NATO 5'' BILLET UPPER ASSEMBLY / 4'' MLOK / SHARK / FLAG DC and CH:Featuring a sleek desi..
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AR-15 5.56 NATO 6" Modular Pistol Upper Assembly | Hybrid MLOK | A2 Flash Hider
Upgrade your AR-15 build with the Moriarti Arms 6" 5.56 NATO Modular Pistol Upper Assembly—engineere..
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AR-9 5.5" Slick Side Spitfire Pistol Upper with Hybrid BCG and Charging Handle - Non-LRBHO
The AR-9 5.5" Slick Side Spitfire Pistol Upper is the perfect choice for building your 9mm AR pistol..
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AR-9 9MM 5.5" 'Beware' Pistol Build Kit – Forged Upper, 4" Handguard, Non LRBHO
Build your ultimate AR-9 9MM Pistol with this 5.5" 'Beware' Pistol Build Kit, featuring a Forged Upp..
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AR-9 9MM 5.5" Complete Pistol Upper Receiver with Sound Forwarder
The AR-9 9MM 5.5" Complete Pistol Upper Receiver with Sound Forwarder is a high-performance, blowbac..
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MA-9 9MM 4.5" ENHANCED SPORTING SERIES MINI GLOCK STYLE PISTOL / SBA3 / FDE / NON-LRBHO
The MA-9 9mm 4.5" Enhanced Sporting Series Mini Glock Style Pistol by Moriarti Armaments offers a sl..
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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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Moriarti AR-9 9MM 5.5" Mini Mlok Upper Assembly – Cone Muzzle, AR-15 Upper Receiver, Made in USA
Enhance your AR-9 build with the Moriarti AR-9 9MM 5.5" Mlok Mini Upper Assembly featuring a slim pr..
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MA-9 9MM Glock Style 5.5" Classic AR Pistol by Moriarti Arms / Mlok / Non-LRBHO
Enhance your shooting experience with this Glock-style mini pistol, designed for superior accuracy a..
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Moriarti 5.5" 9mm 1:10 Elite Barreled Upper with 7" M-LOK Rail & Flash Can – Choose Color
Moriarti Armaments presents the 5.5" 9mm 1:10 HBAR Elite Barreled Upper, featuring an ultra-durable ..
-600x600-228x228.webp "AR-10MM 4\" Slick Side Complete Cone Upper – M-LOK, Non-LRBHO | Moriarti Arms")
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AR-10MM 4" Slick Side Complete Cone Upper – M-LOK, Non-LRBHO | Moriarti Arms
Built for compact power and sleek design, the AR-10MM 4" Slick Side Cone Complete Upper by Moriarti ..
AR-10MM 5" Slick Side Complete Upper | LRBHO | Micro ARP | Moriarti Armaments
Experience the power of 10mm Auto in an ultra-compact package with the Moriarti AR-10MM 5" Slick Sid..
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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..
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AR-15 5" 5.56 NATO Micro Semi Auto Pistol | The Chameleon | Purple & Rainbow PVD Accents
The AR-15 5" 5.56 NATO Micro Semi Auto Pistol | The Chameleon combines performance and unique aesthe..
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MA-10MM 4" Micro Glock Style Pistol / Custom Anodized Colors / Non-LRBHO
CURRENT ETA: 6-8 WEEKSIntroducing the MA-10MM 4" Micro Glock Style Pistol — your compact and customi..
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MA-9 9MM 4.5" MICRO GLOCK STYLE PISTOL / NON-LRBHO - CHOOSE COLOR
The MA-9 9MM 4.5" Micro Glock Style Pistol is the perfect choice for those looking for a compact, hi..
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Moriarti Arms AR-10MM 4" Micro Glock Style Pistol | Anodized Black | Non-LRBHO | Blowback
The Moriarti Arms AR-10MM 4" Micro Glock Style Pistol offers superior power and precision in a compa..
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AR-10MM 4.5" MLOK COMPLETE PISTOL KIT /SLICK SIDE/NON-LRBHO
Moriarti Arms, Blow Back, 10MM, 4.5" Barrel, Black Finish, Slick side upper, Non-LRBHO, Mlok, Glock ..