HK USP Full Size 9mm Conversion Barrel, Standard Length

For Heckler & Koch

$246.99
(2 reviews) Write a Review

THIS BARREL IS A CONVERSION BARREL FOR THE HK USP FULLSIZE 40S&W CONVERTING TO 9MM

IT ONLY FITS THE .40 CAL SLIDE! 

THIS BARREL WILL NOT WORK IN THE 9MM SLIDE!

 

Barrel Features:

• Standard Length Barrel

• Length: 4.25"

• Caliber: 9MM

• Brand: Heckler & Koch

• Model Compatibility: USP 40 Full size

• Rifling: 1:10LH Button Rifled

 

EFK Fire Dragon Pistol Barrels
THESE ARE SOME OF THE FINEST PISTOL BARRELS MADE IN THE WORLD!
Because of the care exercised in manufacturing and our refusal to compromise on any step of the process.

  • We use the finest material available (type 416 Stainless Steel)
  • Machining processes are accomplished on CNC equipment for close-tolerance production.
  • Heat treating is done in a vacuum furnace for clean, consistent hardness of 40-42Rc

The end result is a good-looking, top-quality barrel with consistent, accurate and long-lasting performance. And don't forget the service. We deal with our customers on a personal level to ensure their complete satisfaction on all of our products.

Industry standard is 150 rounds to break in a barrel before threading any device on to the barrel.

***When a barrel contains the word "conversion", it means these barrels work only in 40S&W and .357 converting to 9mm.

You cannot go from a 9mm to a 40S&W or 357Sig

For best results converting to 9mm from 40 S&W use a 9mm mag.

EFK Fire Dragon products are warranted against breakage to the original purchaser for the lifetime of the product, excluding normal wear and tear. All warranty claims are subject to evaluation by EFK Fire Dragon. If the product is determined to have been used in a manner other than as intended by the manufacture, the warranty may be voided. See our Shipping & Returns page for more detailed information!

2 Reviews Hide Reviews Show Reviews

  • 5
    Absolutely Perfect

    Posted by Joe on 16th Jun 2026

    Fit is impeccable, barrel locks up like a bank vault and the stainless finish feels so incredibly butter smooth. Locks open on last round with perfect feeding. If you have a Usp40, you chose the right caliber to get it in, this conversion barrel just gives you alternatives.

  • 5
    Outstanding

    Posted by Daryl Kirby on 15th May 2026

    Just received the barrel yesterday. Quite hefty, crowned and very nicely finished. Plan on a little range time with my KG USP FS SS in the next few days. I plan on trying both 40 and 9mm magazines, I read that some folks have had success with 40 mags, we'll see.

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