Pistol Length
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. Designed specifically for compact AR pistol and mini ARP builds, this premium upper combines the proven performance of 300 AAC Blackout with lightweight construction and premium American-made components.
Featuring a 5-inch barrel, Spitfire Flash Can, and free-float M-LOK handguard, this complete upper is engineered for exceptional reliability and maneuverability. The 300 Blackout cartridge was specifically developed for short-barreled AR platforms, making this Micro ARP upper an outstanding choice for shooters seeking a compact, versatile firearm.
Compatible with mil-spec AR-15 lower receivers, this complete upper is ideal for custom ARP builds, recreational shooting, and range applications while maintaining the modularity and performance expected from the AR platform.
Key Features:
Chamber: 300 Blackout – Optimized for 300 BLK cartridges, perfect for short-barrel setups and suppressed shooting.
Barrel: 5" 4150 Chrome Moly Vanadium (CRMOV) – Heat-treated with a black nitride finish for superior durability and corrosion resistance. The 1/7 twist rate ensures stability for heavier projectiles, ideal for both subsonic and supersonic ammunition.
Muzzle Device: Spitfire with QD Blast – Featuring a quick-detach (QD) blast-style muzzle device, this helps mitigate recoil while providing efficient muzzle control, ideal for short-barreled rifles and pistols.
Barrel Threads: 5/8x24 – Compatible with a wide range of suppressors and muzzle devices.
Handguard: 4" Slim Profile Mlok Free Float – A lightweight, Mlok-compatible handguard, hardcoat anodized for durability, and perfect for mounting lights, lasers, and other accessories.
Gas System: Micro Length – The Micro gas system ensures a smooth, reliable cycling of the weapon while maintaining a compact, efficient build for use in confined spaces.
Gas Block: .750 Low Profile Gas Block – Constructed from steel with a nitride finish, this gas block is designed for long-lasting performance in harsh conditions.
Upper Receiver: A3 Flat-Top Upper – Crafted from 7075-T6 aluminum, this upper is black hardcoat anodized to military specifications for maximum strength and corrosion resistance. Includes forward assist and dust cover.
Specifications:
- Weight: 2.5 lbs
- Overall Length: 15"
- Platform: AR-15
- Barrel Length: 5"
- Barrel Material: 4150 CRMOV
- Twist Rate: 1/7
- Muzzle Thread: 5/8x24
- Gas Block: .750 Low Profile Steel, Nitride Coated
- Gas System: Micro
Additional Notes:
- Bolt Carrier Group (BCG) and Charging Handle are not included but can be purchased separately.
- Images may not be an exact representation of the product due to variations in design or finish.
Is a 5-inch 300 Blackout upper suppressor-ready?
Yes. Many 5-inch 300 Blackout uppers are designed with suppressor compatibility in mind and feature standard muzzle threads that accept compatible suppressor mounting systems. 300 AAC Blackout is especially well suited for suppressed shooting thanks to its ability to reliably use both subsonic and supersonic ammunition, making it one of the most popular calibers for Micro ARP, ARP pistol, and other compact AR platform builds. Always verify your thread pitch and suppressor compatibility before installation.
