D9 (Defender 9mm)
For roller-delayed actions - MP5

I own the AAC Ti-Rant 45 & 9S. The D9 outperforms them both. Not only quieter but has a noticeably different tone or pitch with subsonic ammo. I noticed the same thing when comparing the Acadian Armament LYNX to the SilencerCo Sparrow. I bought the AAC Ti-Rant 9S to use exclusively on my Sig MPX SBR because of its compact size. I gave up on it because it's louder and has more blowback. The D9 now lives on the MPX permanently. My only hit on the D9 is weight, it's a bit heavy for use on pistols but, as I was told, it was made for MP5s and the likes. This is an excellent product!

I’m not what you would call a “Tactical” kind of guy, I’m more of a redneck who loves to hunt and fish.    So when Ruger came out with their Pistol Caliber Carbine in 9mm, I knew I had to have one of those adult size 10/22s.    After shooting nearly 5,000 rounds through it, most of which were through my 45 cal suppressor, I’ve learned one thing...I’m not a fan of suppressing a 16 inch 9mm barrel.  It just seems to bulky with too much bang coming out the end of it.  That was until last April.   That’s when Acadian Armament allowed me to spin up the D9 suppressor onto the end of my PCC.  WOW!!!   Or should I say wow...   I was shocked at how much quieter it was.  I assumed it was simply because I was using a dedicated 9mm can and not substituting a 45 cal can onto a 9mm.  So I tracked down a few other people at the range who also let me try out their 9mm cans.    While I was still amazed at how quite my little 9mm PCC was I was now even more amazed at how quieter the Acadian Armament’s D9 was compared to the other two brands.    

Needless to say I am currently saving my beer cans to afford my own D9.   I think it’s gonna be great to have it on my PCC come next hog season.   

So shout out to the folks at Acadian Armament for yet another great suppressor.   

West Monroe, LA

Shooting the Acadian Armament D9 suppressor on a H&K MP5 submachine gun was fantastic. The MP5 ran flawlessly with no gas blowback in the face. The reduction in recoil was significant and of course the sound suppression was great. It was quiet enough to run without hearing protection even in confined areas (even though I do not encourage that due to concussion unless necessary).

I have used and sell in our retail Acadian's products for over a year now. The capabilities, quality, and ease of use make Acadian silencers one of my go to silencer products.  We have transferred several silencer to their new stamp owners and they are very satisfied with their wait once they get out to the range. Our community is densely populated with highly trained MIL/LEO  personnel that have put their faith into Acadian as well. A+ Great design & Manufactured in the USA.​

SFC Andrew Rencich (Former US Army Special Forces - 18F) & P/CEO of AA Tactical Inc.

I can honestly say that the D9 is the best suppressor that I have fired in my 9mm. I tested it against my Gemtec GM-9. I attached the D9 to my Sig p226 Legion and I attached my Gemtec GM-9 to my Beretta 92A1. I took them to an indoor range and fired them side by side. I used Fiocchi 9mm 115gr and Fiocchi 156gr subsonic 9mm. I loaded each mag with 3 subsonic and 3 supersonic. Then fired them side by side. The D9 was noticeably quieter with both super and subsonic ammo. I can't wait for this to hit the open market. Personally I love the weight of it.

Buckfins-n-Feathers - Manager

I am retired Army with a couple of combat tours and currently a sniper on my agency Special Response Team. I have an MP5 assigned and have used the MP5SD on prior occasions. I recently had an opportunity to fire my MP5 with the D9. I believe the sound reduction was better than was on my MP5SD. I appreciated the recoil management offered by the D9 as I was able to maintain rounds on target much easier than when I fire it unsuppressed. I did not notice a shift in my point of impact as compared to my point of aim. The added weight of the suppressor was very manageable, almost unnoticed, and the coupler made attaching and detaching much easier than the suppressor I currently use on my M4. I hope this information is useful. 

Okaloosa County Sheriff's Office - Special Investigations

I recently evaluated the following suppressors on the MP5 and MP5K platforms;

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  Acadian Armament Defender 9 (D9)

  SilencerCo Omega 9K

  DeadAir Armament Wolf 9SD

It is easy to determine which one of these three suppressors are more aesthetically pleasing; it’s the D9. Its length is between that of the other two, with a much smaller diameter. Its compact size feels exceptionally well balanced on the front of a pistol caliber carbine, particularly the MP5 platform. I am more accustomed to the bulk of a Gemtech MM-9 on a CZ Scorpion, and handling the Zenith Z5/D9 combo was a delight. I started off my shooting session by warming up on steel; ah, the old familiar sound of a suppressed 9mm hitting steel. But, what wasn’t familiar was the lack of smoke exiting the muzzle, very little to no muzzle rise/recoil, and zero gas to the face. I quickly increased target transition speed which was incredibly easy with this balanced weapon system.

I then began to shoot from a bag rest to a paper target at about 35 feet. Changing the indexing on the 3-lug mount and shooting three rounds on each, I shot the Wolf, Omega, then the D9. The Wolf is big and bulky, and I saw major POI shift (9-10”) when changing indexing points on the 3-lug. The Omega 9k and D9 both did well in holding groups. The D9 held groups slightly better. No gas to the face with any of these, however both the Omega 9K and Wolf 9SD produced more smoke than the D9. As far as sounds goes, it was tough to hear a difference from the shooter perspective. They all suppressed the sound of the gas boom well, but the sonic crack in this small outdoor range ruined any chance I had at telling the difference.

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The D9 and the Omega 9k ran a tight race in this demo, but the D9 has it beat in my book for a few simple reasons. First, it can be taken apart and cleaned piece by piece. Secondly, it seemed to cool faster than the other two suppressors. Thirdly, the D9 is rated for pressured way higher than 124gr 9mm produces. I really want to shoot it on Zenith’s Z43 in 300blk…it’ll handle 300blk supersonic as well! And finally, the D9 is optimized for the MP5 platforms, so it comes standard with a tri-lug mount, and I hear that Acadian Armament will soon be offering mounts to fit pistols and threaded 3-lug adapters for fixed barrel pistols/rifles.

Maschmedt & Associates - Manufacturers Representatives