.22 LR Silencer  Model: CNC2000

A lot of people don't know this, but you can legally build your own silencer.  This is assuming you can legally own a firearm and the silencer is legal in your state.  In order to build your own silencer, you must first fill out a Form 1, get finger printed, fill out a citizenship form, get your chief of police to sign the Form 1 and send the BATF a check for $200 along with all your paperwork.  You can download all the forms from the BATF website.  Here are the forms you'll need to fill out...

(2 copies) ATF F 5320.1 -- Application to Make and Register a Firearm

(1 copy) ATF F 5330.20 -- Certification of Compliance with 18 U.S.C 922(g)(5)(B) -- citizenship form 

You'll have to get 2 ATF finger print cards from your local Class III firearm dealer, or you can order them from the BATF at this link.  It's the "FBI FD-258LE - NFA, Imports ORI DCATF0100"

After you get all the forms filled out, you then send them to the BATF along with your check for $200.  Do your best to forget about the forms, because it's going to take 90-120 days before they are approved.  But hang in there because if you can legally own a firearm, then you can legally build your own silencer.  You can find more info about NFA firearms on the AR15.com forum.

As soon as my approved paperwork is returned to me, I'll then and only then be able to build my own silencer.  The silencer I'll be building will be in a .22LR caliber and designed off of the H&K MP5SD silencer.  The MP5SD is designed for 9mm, but I'm going to be making some changes in order to use it with a .22LR pistol. Below you can see what the inside of the MP5SD looks like (pic from www.hkpro.com)...


After a long wait (about 3 months), I finally got my paperwork approved.  Instead of trying to deal with all the little sheet metal parts to make the H&K design, I decided to go with a K baffle design.  The K baffles would be much easier to make, and most importantly I wouldn't have to worry about welding all the little sheet metal pieces together while at the same time making sure that everything is exactly lined up.  I done some reading on the www.silencertests.com website to get a better feel for how silencers worked.  During my research, I found out that there are several different designs out there.  Below you can see what my K baffles look like...

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In my design, there are five K baffles and one blast chamber.  I've read that there needs to be a blast chamber for most of the gases to expand right out of the barrel.  The whole silencer is made out of 2024 aluminum except for the end cap that screws onto the end of the barrel.  I made this piece out of 303 stainless steel, since it would wear out quicker if it was aluminum.  I drilled six holes in both the end caps so I could use a custom made spanner wrench to install and remove the end caps.  These holes do not go all the way through the caps, just deep enough for the studs on the spanner wrench to engage the caps.  Below are pics of the finished silencer... 

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I have sent in more paperwork to the BATF.  This time I sent in paperwork to do a short barrel rifle (SBR) and another silencer for the AR45.  My plan is to use a threaded 7" barrel on the AR45 and then attach a silencer that is about 12" long.  The end of the barrel will set about 3" inside the silencer.  So once the silencer is attached, it will look like the AR45 just has a big 16" long bull barrel.  I will be using a set of quad rail free float hand guards.  It should be a pretty cool little setup.

Below you will find a blueprint of my K-baffle design.  It is the only blueprint I made during the build.  The rest of the parts I just machined as I finished the silencer...

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