Ammo Bundle | 7.5" Barrel (300 Blackout) | 5/8 x 24 + 40rds Winchester .300 AAC Blackout Ammo 125 Grain FMJ

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Product Code: KM-300BLK-75-MED-P-USA300BLK
MSRP: $185.95
Sale Price: Sale Price: $115.95
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Ammo Bundle | 7.5" Barrel (300 Blackout) | 5/8 x 24 + 40 rd Winchester USA300BLK .300 AAC Blackout Ammo 125 Grain FMJ

Barrel Specs:

This 7.5 inch Pistol Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish.

Quench Polish Quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite. QPQ is a huge improvement over Chrome Lined barrels. Unlike chrome lining, where the chrome is built up on the surface, QPQ converts the surface without the risk of dimensional build up. The technique is used when two or more of the following properties are required in a work piece:

  • wear resistance
  • corrosion resistance
  • lubricity
  • fatigue strength


  • Length - 7.5"
  • Material - 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
  • Finish - QPQ Corrosion Resistant
  • 11-Degree Target Crown - Further improve accuracy
  • Gas System Length - Pistol
  • Profile - Medium
  • Gas Block Journal - .750" Gas Block Journal
  • Twist Rate - 1/7 Twist
  • Muzzle - 5/8x24 Threaded Muzzle
  • Weight - 21oz
  • Other Info - QPQ coated M4 Feed Ramp Extension
  • Barrel Type - Button Rifled - 5R
All NFA/ATF Rules Apply
Depending on your state and local laws, you could use this barrel with a lower receiver that is a Registered SBR, or Pistol. Possession of this barrel along with a Non-NFA lower receiver may be Prohibited. We are not lawyers and the above information is not legal advise. Make sure you understand the most up to date federal, state and local laws before proceeding with this product.

Ammo Bundle:


Backed by generations of legendary excellence, Winchester "USA White Box" stands for consistent performance and outstanding value, offering high-quality ammunition to suit a wide range of hunter's and shooter's needs.

  • Caliber: .300 AAC Blackout
  • Bullet Type: Full Metal Jacket Open Tip Range
  • Bullet Weight: 125 Grain
  • Rounds: 20 Rounds per Box
  • Muzzle Velocity: 2185 fps
  • Muzzle Energy: 1325
  • Bullet Ballistic Coefficient: .267
  • Casing: Brass
  • 20 Rounds Per Box
Ammo will be shipped separately from other items on the order.

Please note: We will not ship ammunition to the following states: CA, AK, HI, NY, D.C., MA, IL, CT, and NJ. This is not legal advice, and we encourage you to check your local and state laws prior to ordering.
Maximum Purchase:
12 units