5" 300 BLACKOUT MICRO PISTOL MED PROFILE 1:5 RH TWIST M4 BARREL EXTENSION 4150 CrMoV BLACK NITRIDE FINISH - 300MP5MED50B5
$99.99
Out of stock
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.
| Weight | 12 oz |
|---|---|
| Dimensions | 7 × 3 × 3 in |
| Finish | Nitride / Melonite |
| Barrel Profile | Micro |
| Cartridge Compatibility | 300 BLK |
| Gas Block Journal | 0.75 |
| Barrel Length | 5 |
| Gas System Length | Micro |
| Platform | AR-15 |
| Twist Rate | 1:5 |
| Muzzle Thread Pattern | 5/8×24 |
| MPN | 300MP5MED50B5 |
| UPC | 28742 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
Please select an FFL from the table below, if you do not see your desired FFL, click "Set Later" and you will be able to enter your FFL's information after checkout.
| Name | City | State | ZIP | Phone | |
|---|---|---|---|---|---|
|
Loading FFL contacts, please wait...
|



