S&W 625 fully suppressed revolver

The PSDR 3 is a fully suppressed .45 ACP Smith & Wesson Model 625 revolver developed in 1993 by Joe Peters, under contract from Northrhine-Westphalia, for Germany’s SEK (SWAT) teams.

This photo is from Visier Special 6, 1997 (special edition of one of the three big German gun journals):

Psdr 3
Click to expand.

Revolvers cannot be effectively suppressed because gas escapes from between the cylinder and the barrel creating noise (there are some exceptions). The big shell that encloses the cylinder of the PSDR 3 prevents the gas from escaping. This combined with a big suppressor and a subsonic .45 ACP round causes a noise reduction from 136 dB to 90 dB which is comparable to a CO2 air gun. Decibels are a logarithmic unit of measurement, so a 46 dB reduction is significant. In theory this gun should make a lot less noise than a suppressed semi-automatic pistol because there no slide slamming open and closed.

I had no idea such a gun existed until Sven emailed me. I really like the idea – German engineering at its best!
Many thanks to Sven, who blog at Defense and Freedom, for the scanned page and translation.

Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


  • You need to look up the suppressed Ruger GP100 and Super Redhawk that KAC developed. The telescoped ammunition they used was a pretty clever method to seal the cylinder gap.

  • Good post.


  • kvalseth

    Or you could just do this: http://www.youtube.com/watch?v=vvF4yurWSc0

  • Alre


  • Interesting. I had always assumed that a suppressor on a revolver was a mug’s game. Not so, it seems.

  • guy

    Those disk shaped devices on the front of the cylinder interest me.

    Do those mate with the big cover to provide a better seal, or are they just a bearing surface to help the cylinder rotate smoothly against the tight fitting shell?

  • Valhalla

    What beauty… its elegant cylinder, its sublime scope thingamajigit…

    For all the assassins, no jamming, no sound, and coming soon, no bullets.

  • Gees, I guess it goes to show you can engineer your way around anything, but I can’t see an advantage over a simple bolt-action with a threaded can. I mean you have to pop open two cylinder seals to reload, and all so you can get six consecutive shots of a double-action revolver trigger?

    • EmptorMaven, over a bolt action I would say it is probably shorter in length, you can fire faster (just pull the trigger, no bolt cycling). After more than a couple of shots I imagine your target(s) probably know you are about and best pull out a high capacity sub gun/pistol/rifle.

  • Nick

    “but I can’t see an advantage over a simple bolt-action with a threaded can.”

    Are you serious? Obvious advantage: Size. A bolt gun isn’t a huge lot of good inside a building, or in a position where you’re only a few meters away from your target.

  • Nick

    I assumed we were talking about something like a Rem. 700, but I guess that counts too. Forgot about it.

  • Starik Igolkin

    Very cool, but from practical side it looks over-engineered, to be honest. Wouldn’t Nagant M1895 with a silencer do the same thing simpler and cheaper?

  • That’s German engineering for you. I hear that a German anvil has 30 moving parts, and has to be wound every ten minutes of use.

  • that’s awesome

  • SplitHoof

    Another solution to a problem that dosen’t exist. You could supress an Uzi pistol in the same caliber for a lot le$$, in a smaller package. However, the European’s are known for over-engineering everything.

  • komrad

    I’d take a DeLisle .45 acp carbine over that thing. It was so quiet that working the bolt was loader than the gun firing.

    • Para

      So were a lot of WWII .45s
      .45 is very easy to suppress. Remember that the DeLisle was functionally a .45 SMLE, so it had all that barrel volume to turn into suppressor.

  • J of J

    i like the kac vertion beater

  • Germanicus

    Well…this is proof of the possible married to the impractical! This beast needs a shoulder sling rig! It might sell in a Hollywood Sci-Fi movie!

  • Norbert Schaefers

    Well, i shot this thingy. The loudest noise on an indoor range was the bullets hitting the sand. It looks heavier and bulkier than it is. The silencer is made of titanium. There is also a version with bipod and folding stock. And the accuracy on 50m is just oustanding. It is definitely worth its money. BTW. With a .45 bullet 300grs. it usually takes only one shot to take out a target.

  • Isaac Granberry

    two words, Nagant pistol. enjoy