Sale

Heckler & Koch MR223A3 Semi-Auto Rifle | 16" Barrel

Heckler & Koch
SKU:
MR223A3-16
$4,999.00 - $5,995.00
(12 reviews)
Current Stock:
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The Heckler & Koch MR223A3 is the civilian semi-auto equivalent to the legendary HK416A5. Made of genuine German H&K parts, unlike the US made and assembled MR556, the MR223A3 is the real deal!

Experience German engineering at its finest with the Heckler & Koch MR223A3, a 5.56mm semi-automatic rifle built for precision, reliability, and exceptional performance. Featuring a 16.5" hard chrome-plated, free-floating barrel, this rifle delivers high accuracy and excels in adverse climate conditions, ensuring dependable operation in any environment. Incorporating technology from the renowned G36, the MR223A3 offers superior accuracy, functionality, and handling, making it a top choice for tactical and professional applications.
The rifle is equipped with a slimline handguard featuring HKey mounting slots for versatile accessory attachment, and a length-adjustable six-position stock. Compatible with AR15-pattern magazines, including Magpul PMAG, the MR223A3 combines adaptability with combat-proven design. Whether for professional use or precision shooting, this rifle sets the standard for excellence in the 5.56mm platform.
 
Specifications:
  • Caliber: .223 Remington / 5.56x45mm NATO
  • Operating Principle: Semi-Automatic, Gas-Operated
  • Bolt System: Locked Rotating Bolt Head
  • Magazine Capacity: 10, 20, 30 Rounds
  • Magazine Compatibility: AR15-pattern magazines, including Magpul PMAG
  • Cartridge Case Ejection: Right
  • Modes of Fire: Semi-Auto
  • Trigger Pull: 5.6 lbs (25 N)
  • Barrel Profile/Twist: Groove/Land Profile, 6 Grooves, Right-Hand Twist
  • Sights: Mechanical Dioptre Sight, Foldable
  • Barrel: Hard chrome-plated, free-floating for high accuracy
  • Handguard: Slimline with HKey mounting slots
  • Stock: Six-position, length-adjustable
Dimensions:
  • Length, Min.: 33.54 inches (852 mm)
  • Length, Max.: 37.32 inches (948 mm)
  • Width: 2.91 inches (74 mm)
  • Height: 7.52 inches (191 mm)
  • Barrel Length: 16.5 inches (419.1 mm)
  • Sight Radius: 14.61 inches (371 mm)
Weight:
  • Weapon (without Magazine): 8.38 lbs (3.8 kg)
  • Magazine: 4.94 oz (140 g)
Features:
  • Barrel: Hard chrome-plated, free-floating for superior accuracy
  • Performance: Excellent results in tests under adverse climate conditions
  • Technology: Incorporates G36 technology for enhanced accuracy, functioning, and handling
  • Handguard: Slimline design with HKey mounting slots for accessory versatility
  • Stock: Six-position adjustable
  • Magazine Compatibility: Accepts AR15-pattern magazines, including Magpul PMAG

Reviews

  • 5
    Mr223

    Posted by JC on 16th Jul 2025

    This is a very nice rifle. Im very happy. Thanks AU

  • 5
    Thanks you Arms Unlimited !

    Posted by The Steyr AUG on 11th Sep 2022

    Always the best possible experience. Thank you for making these desirable collectables available. You bring to the best table above all others.

  • 5
    HK MR223

    Posted by Alex Gonzalez on 2nd Sep 2022

    Excellent company and will continue to buy from them!

  • 5
    MR223A3

    Posted by Randy Shackelford on 25th Dec 2021

    Arms Unlimited and their Staff shipped the firearm quickly and handled everything as Professionals!

  • 5
    Simply beautiful…

    Posted by Christian S on 23rd Dec 2021

    What’s more to say… 100% German import HK. ArmsUnlimited did a great job on these. Received exactly what I wanted and worth every penny

  • 5
    HK MR223A3 16"

    Posted by Clearman on 23rd Dec 2021

    Thanks for the opportunity to purchase a 100% German made firearm.

  • 5
    Exactly as advertised.

    Posted by GHB on 21st Dec 2021

    AU delivered an essentially unobtainable item at a reasonable price. The MR223 is plainly better finished than the (admittedly nice) us made MR556. Everything came with the gun as advertised including tools, sights, books, etc. the shipping was a bit slow but whatever. I’m very happy.

  • 5
    Very Nice

    Posted by P Magnus on 21st Dec 2021

    Very nice and feels better than my extra heavy barreled MR556A1. I’ll be honest and say that I would not be writing this review if I did not snag it on Black Friday and save $2k. Nice rifle but not worth $7k retail price. It’s worth $5k for the chrome lined barrel, new ergonomics and German proof marks.

  • 5
    The bestest ever

    Posted by dane on 26th Nov 2021

    Missed this gem 3 times in 2 years, but not this time, not this time:) I think I’ve put a few of their kids through collage at this point and I’m still spending. Keep bringing us the goods.