Anyone who is serious about weapons and their use in not so friendly places knows who the Knights Armament Company (KAC) is. They have been in the industry for 30 years supplying the US military with some of the best gear you can buy.  Recently, I got to spend some time with the Knights Armament QDC silencer.

Given their reputation for making the gear our special operations guys use I was very excited to test out their QDC 5.56 silencer. I wanted to do more than run it at the range by myself and as luck would have it I had a rifle training class come up with KR Training and I thought it would be the perfect environment to try it out in. In addition to running it in the class I took it to our private range and ran it.

QDC specs:

  • 18oz in weight
  • 6.69″ long
  • 29db claimed sound reduction
  • Full auto rated
  • Inconel and Stainless steel construction
  • High temp Cerakote coating
  • Quick detach to the QDC mount

The KAC QDC is designed for hard use and it’s price reflects that.

These are not cheap but are meant to take a lot of abuse and hold up.  One of the things that they really did right is the interface between the silencer and the flash hider mount.  They separate the locking system from the mounting surface.  What this does is prevents carbon buildup from interfering with a consistent lockup which results in a consistent point of aim/point of impact.  It also means it goes on and off easy, even after a lot of rounds through it.  I also like the fact that the use a flash hider vs a brake as if you had to run this without the silencer attached and don’t have ear pro on you aren’t going to get pummeled with a brake.

Yes, you should wear ear pro when shooting above a safe hearing level but if you need it NOW! and don’t have the can on you are less likely to have permanent hearing damage with a flash hider as compared to a brake.  That is even more important if you are indoors.

I thought the KAC 556 QDC did a very good job at sound suppression, muzzle control and keeping the sights on target for fast followups as well as a consistent POA/POI.

I would love to have this on my AR and that is about as good of an endorsement as I can give.

Check it out at the Silencer Shop


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Founding staff member, avid shooter, hunter, reloader and all around gun geek with an obsession for perfection

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