Moriarti Micro-LengthAR-15 5.56 NATO Barrel 6 in 1-7 Twist Medium Profile QPQ Finish Black Anodized. 56 NATO 6 in Micro Gas QPQ Barrelengineered for shooters demanding extreme maneuverability superior corrosion resistance and optimal performance in short-barrel platforms. Precision-machined from 4150 Chrome Moly Vanadium steel this barrel features a QPQ (Quench Polish Quench) nitrocarburized surface offering enhanced strength reduced friction and far greater corrosion resistance than traditional chrome lining. QPQ converts the surface at the molecular level without dimensional buildup resulting in a smoother harder and more durable finish. The micro gas system is optimized for ultra-short AR-15 pistol configurations delivering reliable cycling when paired with proper tuning. A 1:7 twist stabilizes a wide range of 5.56 projectiles and the barrel is threaded 1/2x28 for use with standard muzzle devices and suppressor mounts. Outfitted with a QPQ-coated M4 feed ramp extension and an 11-degree target crown this barrel is built for consistency durability and accuracy. Perfect for PDW builds ultra-compact AR pistols and high-performance personal-defense platforms. Specifications for Moriarti Micro-LengthAR-15 5.56 NATO Barrel: Manufacturer: Moriarti Color: Black Finish: QPQ Fabric/Material: Steel Caliber: 5.56x45mm NATO Barrel Length: 6 in Barrel Profile: Medium Barrel Twist Rate: 1-7 Gun Make: AR Platform Gun Model: AR-15 Firearms Threads Per Inch: 1/2x28 Features of Moriarti Micro-LengthAR-15 5.56 NATO Barrel QPQ nitride finish for maximum corrosion resistance and surface hardness Micro gas system designed for short-barrel reliability 1:7 twist for versatile 5.56 ammo compatibility Threaded 1/2x28 for standard muzzle devices Machined from 4150 CMV steel for durability M4 feed ramps for reliable feeding 11-degree target crown for consistent accuracy Package Contents: Moriarti Micro-LengthAR-15 5.56 NATO Barrel What firearm models does the manufacturer say Moriarti Micro-LengthAR-15 5.56 NATO Barrel is compatible with? The manufacturer says that Moriarti Micro-LengthAR-15 5.56 NATO Barrel is compatible with AR-15Moriarti MAR-556-6-BRL: Micro-LengthAR-15 5.56 NATO Barrel 6 in 1-7 Twist Medium Profile QPQ Finish Black Anodized