TacFire 5" .300 Blackout Heavy Contour Barrel Black Nitride - BU3005

TacFire BU3005 300 Blackout 5" Black Nitride Barrel - BU3005 - 729205967122

Product Description

Building an ultra-compact PDW (Personal Defense Weapon) or micro-pistol AR platform chambered in .300 Blackout often creates cycling challenges due to improper dwell time, gas port sizing, and barrel length constraints. Standard 7.5" or 10.5" barrels add unnecessary length for concealed backpack staging or vehicle cabs, while lower-quality short barrels struggle to reliably cycle heavy subsonic rounds. The TacFire 5" .300 Blackout Pistol Barrel (BU3005) resolves these maneuverability and dwell time bottlenecks by delivering an ultra-short 5-inch profile paired with a pistol-length gas port engineered specifically for short-barrel dwell time dynamics.

Precision-machined from high-strength 4150 Chrome-Moly Vanadium (CMV) steel, the BU3005 features an ultra-durable Black Nitride (QPQ) protective coating. This salt-bath nitride treatment hardens both internal bore surfaces and external contours, providing maximum resistance against throat erosion, surface rust, and high heat during rapid firing schedules. Standardized with a fast 1:8" twist rate, the 5-inch barrel stabilizes both lightweight supersonic rounds (e.g., 110gr–125gr) and heavy subsonic loads (e.g., 200gr–220gr) optimized for suppressed shooting.

Threaded in standard 5/8x24 TPI, the TacFire BU3005 accepts popular .30-caliber muzzle brakes, flash hiders, and suppressor direct-thread mounts. Outfitted with M4 feed ramps for smooth cartridge transition from magazine to chamber, it serves as the ultimate core component for micro-sized AR-15 builds and compact truck-gun staging.

*Armorer Bench Notes & Real-World Staging Guidance:

Fitment & Gas System Matrix: Requires a standard Pistol-Length Gas Tube and a 0.750" Gas Block. NFA / Legal Notice: Installing a 5-inch barrel on an AR-15 platform creates a Short-Barreled Rifle (SBR) if attached to a lower receiver with a rifle stock. Ensure compliance with all federal, state, and local ATF regulations regarding pistol braces, tax stamps, and legal staging.

Installation Sequence:

1. Safety check the workspace and clean the upper receiver barrel socket thoroughly.
2. Apply AeroShell 64 / 33MS aerosol grease to the upper receiver barrel nut threads and insert the barrel extension smoothly, aligning the indexing pin with the top notch.
3. Install the barrel nut and torque using an armorer's wrench to 35–65 ft-lbs.
4. Slide a 0.750" gas block and pistol-length gas tube onto the barrel gas journal, aligning the gas port precisely before tightening set screws with threadlocker (Loctite 242).
5. Install handguard, muzzle device (threaded 5/8x24), and perform manual headspacing/cycling checks prior to live-fire testing.

Key Features

• Ultra-Compact 5-Inch Micro Profile: Delivers maximum maneuverability for backpack staging, vehicle defense, and PDW builds.
• 4150 CMV Steel Construction: High-tensile steel alloy withstands rapid heat cycles and heavy firing schedules.
• Black Nitride (QPQ) Finish: Provides extreme corrosion resistance and slick internal surface lubrication for smooth extraction.
• Versatile 1:8" Twist Rate: Accurately stabilizes both supersonic lightweight projectiles and heavy subsonic suppressor ammo.
• Standard 5/8x24 TPI Muzzle Threads: Accepts standard .30-caliber suppressors, compensators, and muzzle devices.
• Precision Machined M4 Feed Ramps: Ensures smooth round feeding from magazine to chamber without bullet nose deformation.

Product Specifications

• Brand: TacFire
• Model: 5" .300 Blackout Pistol Barrel
• MPN: BU3005
• UPC: 729205967122
• Caliber: .300 AAC Blackout (300 BLK)
• Length: 5 Inches
• Gas System: Pistol-Length
• Gas Block Journal: 0.750" Diameter
• Thread Pitch: 5/8x24 TPI
• Twist Rate: 1:8" Right-Hand Twist
• Material: 4150 Chrome-Moly Vanadium Steel
• Finish / Color: Black Nitride (QPQ)