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When approved, where to buy suppressor plans?

Discussion in 'NFA Firearms and Accessories' started by Tallbald, Jul 6, 2010.

  1. Tallbald

    Tallbald Well-Known Member

    When my soon to be filed forms are approved, where would I find plans for an efficient .22 rimfire suppressor design I can build? I'm interested in a stainless steel unit with removable ends for cleaning. Are there plans in the public domain, or does a builder just try to copy a popular generic design? I'd regret going to all the trouble and expense and find there was really no noise reduction. Since I'll be going to a lot of work to file forms and paying $200 for the stamp, I want to make a suppressor I can be proud to show and use. If I understand correctly, I can't begin to buy materials until I have approval in hand. I have read that 1/2-20 is a standard thread for suppressors but don't know what class the fit should be, how long the threaded muzzle portion should be, etc. can I engrave a serial number on it myself then take it to the local office compliance officer to confirm, or would another method be required?I will talk to the local ATF office at each step I guess to make sure I don't run afoul of the law. Thanks, Don
    Last edited: Jul 6, 2010
  2. jmorris

    jmorris Well-Known Member

    No plans that I know of but quite a bit of step by step over at silencertalk.com. 6 K's will work well and be easy to build. There are also a few mono designs to copy too.

    You don't get the plans or final product approved. However, you don't start throwing chips until you have the approved F1 in hand.

    I went with .625" of 1/2 28 threads. They are the standard thread for the small bore stuff I mess with.
  3. mp510

    mp510 Well-Known Member

    If you are building the "firearm" from scratch, which it sounds like you are, you need to submit plans/ schematics with your Form 1, for NFA Branch's records. Unless silencers are illegal where you live, or you are a prohibited possessor, or you use an invalid (thus non-existant) legal entity to file your application- I guarantee that you will be approved. Get your plans together now and then file- but don't start making anything until you get your approved paperwork back.
  4. jmorris

    jmorris Well-Known Member

    I have built many F1 silencers and have yet to submit a "plan". All I have sent is maker, model, ser# and caliber. N/A works for the rest of the blanks.
  5. Tallbald

    Tallbald Well-Known Member

    Thanks you all. I've read about "K" baffles and will have plenty of time to research as I wait for form 1 approval. I see I was not accurate on the thread pitch.Thank you for ther correction. I'll be threading my own muzzle, but need to find a threaded ring gauge to check progress as I thread it. A custom compensator as a thread protector would be a nice touch too.
  6. RhinoDefense

    RhinoDefense Well-Known Member

    Absolutely false.
  7. mp510

    mp510 Well-Known Member

    Read item 4a on the Form 1. You are supposed to include plans and specifications on "proto-types", which this clearly would be.


    Attached Files:

    • 4a.bmp
      File size:
      88.6 KB
  8. RhinoDefense

    RhinoDefense Well-Known Member

    Prototype firearm is that of an actual firearm expelling a projectile, not a silencer. Contact the NFA Branch for particulars. There is no requirement to submit a drawing or plans for any silencer, prototype or not. I've been in this business a long time. As a personal NFA firearm collector, I have filed several dozen Form 1s. None of them had plans submitted including "prototype silencers" that were done on Form 1s. All were approved without question.
  9. Ranb

    Ranb Well-Known Member

    I have submitted ten ATF form 1's for silencer and I have never submitted plans or provided an overall length. The only silencer specific information the ATF gets on my projects are what is engraved on the can. Name, city, state, model and serial number. Nothing else. (opps, I forgot to say I also fill in caliber on the form) While I have heard that some ATF examiners are requiring an overall length, the ATF is not going to get it from me unless they reject the form and send it back for me to fill out. Then I will fold like lawn chair. :)

    I have made two 22lr cans. The first was aluminum with K baffles. The second was a steel tube with two conical stainless baffles and five additional aluminum step cone baffles. The step cones work better than the K baffles. Cones and spacers are easier to remove from the can for cleaning than K baffles because the inside surface of the tubing stays cleaner when surrounded by spacers than with K baffles.

    Here are a few pics from my lastest 22lr project.


    The baffles are .050" thick in front, about .020" thick on the sides. I made spacers from bar stock that are a half inch long and about .015" thick. I used 1/2-28 threads for my 22lr cans.

    These are K baffles from my 9mm can. My 22lr K baffles looked much like these. I like K baffles because they self align very well and require no tension by the end caps and I don't need spacers either. But I think I will stick to step cone baffles in the future.

    Check out http://www.silencertalk.com for more info, especially the silencer smithing forum. There is a sticky thread with a pdf file on threading your barrel. There are loads of drawings and pics also, but few dimensional plans. My finished product rarely looks exactly like any plans or drawings I make up while waiting for approval from the ATF. So it is a very good thing they never ask for silencer plans.

    Last edited: Jul 10, 2010
  10. jmorris

    jmorris Well-Known Member


    They approved your F1's without caliber?
  11. Ranb

    Ranb Well-Known Member

    Opps, sorry. I also filled in caliber on the form. I corrected my post above. Thanks.


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