5" 300 BLACKOUT MICRO PISTOL MED PROFILE 1:5 RH TWIST M4 BARREL EXTENSION 4150 CrMoV BLACK NITRIDE FINISH - 300MP5MED50B5

Discover the ultimate compact powerhouse for your AR-15 build with the 5″ 300 Blackout Micro Pistol Barrel. Engineered for precision and reliability in close-quarters scenarios, this barrel delivers exceptional performance with subsonic and supersonic ammunition, making it ideal for tactical pistols and suppressed setups. Crafted from premium 4150 CrMoV steel with a durable black nitride finish, it ensures longevity and corrosion resistance while optimizing velocity and accuracy in a ultra-short profile.

Key Features

• Ultra-Compact Design: At just 5 inches, this micro pistol barrel provides maximum maneuverability without sacrificing the punch of .300 Blackout rounds, perfect for home defense or concealed carry builds.
• Optimized Twist Rate: 1:5 RH twist stabilizes heavier subsonic projectiles, enhancing accuracy and terminal ballistics for suppressed shooting.
• Advanced Material and Finish: Button-rifled 4150 CrMoV construction with black nitride (Melonite) coating reduces friction, improves heat dissipation, and extends barrel life under high-round counts.
• M4 Barrel Extension: Ensures seamless compatibility with standard AR-15 lowers and bolt carrier groups for a drop-in upgrade.
• Micro Gas System: Paired with a 0.75″ gas block journal, it balances reliable cycling with minimal recoil, ideal for lightweight pistol configurations.

Specifications

• Caliber: .300 Blackout (300 BLK)
• Barrel Length: 5 inches
• Profile: Medium/Micro
• Twist Rate: 1:5 RH
• Gas System: Micro
• Muzzle Threads: 5/8×24
• Finish: Black Nitride
• Platform: AR-15
• Material: 4150 CrMoV Steel

Why Choose This Product?

This barrel addresses common challenges in short-barreled AR-15 pistol builds, such as gas system reliability and projectile stabilization. The fast 1:5 twist excels with 190-220 grain subsonic loads, minimizing over-stabilization issues seen in slower twists, while the nitride finish combats wear from rapid fire. Whether you’re customizing a PDW for tactical use or seeking a versatile suppressor host, this barrel enhances your setup’s accuracy and dependability, ensuring confidence in every shot. Its compact dimensions (7″ L x 3″ W x 3″ H) make it easy to handle during assembly, solving the pain point of bulky components in tight builds.

Elevate your .300 Blackout pistol today—secure this high-performance barrel and experience the difference in precision and control. Perfect for enthusiasts demanding quality without compromise.

Frequently Asked Questions

Q: Is this barrel compatible with standard AR-15 parts?
A: Yes, it features an M4 barrel extension and is designed for the AR-15 platform, ensuring easy integration with most mil-spec components.

Q: Why a 1:5 twist rate?
A: The 1:5 twist is optimized for .300 Blackout subsonic ammunition, providing superior stabilization for heavier bullets commonly used in suppressed applications.

Q: Does the black nitride finish affect performance?
A: Absolutely—it enhances durability, reduces fouling, and improves accuracy by minimizing barrel wear and maintaining consistent rifling.