Heckler & Koch MR223A3 16" Semi-Auto Pistol

Heckler & Koch
(11 reviews)
Current Stock:

Heckler & Koch MR223A3 16" Semi-Auto Pistol


The Heckler & Koch MR223A3 is the civilian semi-auto equivalent to the legendary HK416A5. Entirely made of German parts unlike the US made and assembled MR556, the MR223A3 is the real deal!

The MR223A3 stands out due to its excellent ergonomics and reliability, the gas system was developed for military use and has been well proven over the years. Its short stroke gas system reduces fouling to a minimum. Full ambidextrous controls


  • Hard chrome plated, free floating barrel - high accuracy
  • excellent results in all tests under adverse climate conditions
  • Length adjustable six position receiver extension for installation of brace or stock (ALL NFA rules apply)
  • The technology of the G36 guarantees a high level accuracy, functioning and handling
  • Slim line handguard with HKey mounting slots


  • Caliber: .223 Rem.
  • Operating principle: Gas-operated
  • Magazine compatibility: AR15 pattern magazines
  • Length min./max.: approx. 800/896 mm
  • Width: approx. 74.0 mm
  • Height: approx. 191.0 mm
  • Barrel length: approx. 368 mm
  • Sight radius: approx. 371.0 mm
  • Weight: 3.79 kg


  • 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

    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.

  • 5
    Hk USP Elite

    Posted by Papi Chulo on 26th Nov 2021

    Nice to finally be able to buy an HK product from someone other than HK USA! HK USA has turned into a soup sandwich, these guys deliver with good pricing and great service.