The Best MP5 Suppressor On Earth: The Knight’s KAC Navy

Ok, so my title was a little misleading. The quietest MP5 suppressor is the one that comes on the MP5/SD. The SD is optimized to shoot suppressed and even has a series of ports along the barrel that vent gasses into the first of the can’s chambers. That said, the best can you can buy for an MP5 that is not an SD gun is the Knight’s Armament KAC Navy. However don’t just take my word for it, as the good people at Silencer Talk have tested most cans for the MP5 out there and concluded that the Knight’s offering was indeed the quietest. Their exact words were:

This was the quietest muzzle can in the test. This was apparent even in listening tests and not just on the meter.

The can also has that iconic Knight’s suppressor look that graced the covers of so many magazines in the 90s. The dimples on their sub-gun and pistol cans are iconic and while using an old design, are incredibly good at reducing a firearm’s report.

A little known fact about navy contract MP5s is that they have both the three lug QD mounts and a barrel threaded 1/2×32. Why not 1/2×28? Well, who knows. Maybe HK’s “because we feel like it” attitude rubbed off on Knight’s Armament Company, or perhaps the finer thread does in fact serve a purpose (maybe one of you readers can take me to school on this one).


Either way, when the can is threaded on it sits tight as hell and takes some elbow grease to remove.


When on though, the gun looks like what a SEAL would be running around with during the Clinton years.


So how does it work?

Well, I took a video to try and convey the sound (or lack there of). For this video I used 158 grain sub-sonic, which is so quiet that I feel absolutely comfortable shooting the gun with no ear protection on!

So onto my bullet points.

The Good:

  • Best MP5 can on the market in terms of sound reduction
  • No POI shift at all
  • This is the “correct” can to have on an MP5-N
  • This is an opinion, but I like the way the can looks

The Bad:

  • The can is heavier than comparable suppressors
  • Some people do not like thread on cans and would prefer a QD

The Ugly:

  • These cans are out of production
  • As they are no longer made, they command a premium price and I have seen them sell at $2,000

So that is that. While a damn good can, the KAC Navy is pricey and is getting harder to find. Dealers still have them however, so if you want one then scoop one up now!

Alex C.

Alex is a Senior Writer for The Firearm Blog and Director of TFBTV.


  • KAC also made a can for the SEAL’s MP5SD-N. It used a stainless steel tube, instead of the factory aluminum.

    • I seem to remember that Doug Olson did a write-up of the SEAL’s Qual-A-Tec and KAC suppressors for their HK pistols and SMGs. It was either in the late issues of Machine Gun News or the early issues of Small Arms Review.

  • That classic MP5 full-stock look with the suppressor brings back so many memories of poring over military and gun mags as a youth. So. Very. Bad. Ass.

    • JumpIf NotZero

      The A2 stock really is the only one to have. I have that an the collapsible A3, never ever use it. I wanted a B&T folder, but couldn’t find one for under $400 last I looked, and refuse to pay that.

      • smith

        Try the SAR show in Phoenix. I have a K and I always find right-priced goodies for it there. Snagged that stock for $160, and a MP5K briefcase (claw mount) last time I went.

  • SilentMike

    The KAC can for the MP-5 is a thing of beauty! It has a sweet tone and sports a surprisingly complex internal design and assembly method.

    • JumpIf NotZero

      Zhe Germans.

  • SilentMike

    The 1/2-32 threads were most likely specified by the Navy. They have a history with 1/2-32 threads going back to the stuff Qual-A-Tec made for the MP-5 and P-9S, and, further back, the old S&W Hush Puppy.

  • JumpIf NotZero

    Not for nothing… but a thread-on can for the MP5 is not ideal unless your military made that a requirement (I own one, the three lug is just better for that gun). And that Silencertalk test was done in back in 2005.

    There are better cans now, nine years later. The Gemtech MK9K (the only timeless can they’ve ever made) is good option with some flaws but excels on the authors pros and cons list. A custom can could be made by any number of small mfgs for far less than the Navy, again, excelling in those specific pros and cons. And most people scoot by just fine with a modern pistol can now.

    I think 50% of the appeal of the KAC can is the spot welded look, and the rest is the name / reputation. It’s very cool, but also impractical… more so than the MP5 itself now. Cool gun, and mine sounds like typewriter when suppressed, even handles being suppressed/not well with the 100ยบ locking piece, but “practical” it is not.

    • I seem to remember reading that either NSW or Crane didn’t trust the concentricity of the barrel lugs vis-a-vis the bore. The MP5N and MP5K-N suppressor from Qual-A-Tec was also used on the P9S-N. I don’t see an easy way to disassemble a P9S if it had a three-lug attachment.

      • JumpIf NotZero

        No doubt. The 3-Lug requires a larger bore for certain. It’s just perfectly acceptable to me. Really I can’t imagine my gun being any quieter and the bore in that can is .40″ almost the entire way.

        But… My requirements aren’t mil requirements. And neither is anyone paying $2k for a KAC suppressor.

  • Dan F

    The 1/2×32 was created to prevent 9mm suppressors from being used on 5.56 guns. Your average user is going to look at it and think it will work fine on a rifle as the exit hole is large but get a nasty surprise when he shoots it.

    • Mack

      this is going to sound stupid but what is the surprise? wouldn’t the can just be less effective?

      • Paladin

        My guess is it’s an issue of pressure, pistol calibre cans aren’t built to stand up to the beating a rifle calibre muzzle blast can put out.

        • Mack

          Thanks for clearing that up! but what makes a rifle can so much stronger? are they not the same principle? baffles with out can? or is the materials used different?

          • Paladin

            The difference is mostly in the construction, rifle cans are built thicker and heavier to make them strong enough to contain the pressures generated.

          • Mack

            I gotcha! makes sense! thanks!

    • Atlas

      Flip the situation. If the MP5 muzzle was threaded 1/2-28 you could screw a 5.56 suppressor onto a 9mm weapon; that is the situation they wanted to avoid.

  • Chris

    With data from 2005 I would hesitate to call this the quietest mp5 suppressor on the market. Lots of new tech out since then.

  • dp

    What a piece of work, what a report!

  • dp

    Just a raw question, if someone does not mind to answer it: how would the kind which slips over muzzle suppressor compare? Thanks.

    • Sam Schifo

      You mean the QD model? There would be virtually no difference. One would just be able to detach it in a matter of a second or two instead of having to unthread the whole thing from the muzzle. From what I understand, MP5 threads are quite deep compared to other firearms, and it takes a while to screw things on.

  • Christian Hedegaard-Schou

    If the gun was threaded 1/2×28 then you would be able to install a .22-caliber suppressor on a .35-caliber barrel. What do you think happens to your expensive .22-caliber suppressor when you try to push a .35-caliber projectile down it at 1200 fps?

  • Hunter57dor

    it is truly iconic, my first airsoft replica as a kid was an mp5 with a “silencer” that looked just like these.

  • Marvin Pitts

    The suppressors were made 1/2-36 so they would fit the Colt 9mm AR and the DOE guns