ATF approved! Square silence!!!!! Muahahahahahah!!!

http://www.youtube.com/watch?v=2eyS54AdG_Y&feature=player_embedded


Hey all!!! What do you think?



Man she's quiet!!!
For those of you who don't know me, I am an artist and metalworker of 25 years. I work in steel processing plant running plasma cutters, flat and tube lasers, brakes, and am an accomplished welder in TIG/MIG/ARC and oxy/fuel. I have my strengths.
I had an epiphany one day.
I was running a COF when a competitor arrived with an AR10 and AR that he was swapping a AAC can back and forth from. I was always under the impression that the diameter of the can's hole diverted the gasses because it was so tight and the gas's only alternative was to be diverted to the nearest lower pressure area. But this didnt make sense when a 223 and a 308 both were SUPER quiet using the same can. I had always been discouraged to build a can due to all the high tolerances that I felt I couldn't maintain with my low tech garage shop. The diameter of the hole changed everything for me.... I really started thinking more about fluid dynamics, than design of a 'thing'. How could I disrupt, divert, and peel away the gasses behind the bullet. I arrived at a square can, because fluid hitting 90degree angles seemed the most likely method of ripping the gasses from the back of the slug. What you see below is how I arrived a happy participant in your group....a slightly red-necky one! But a participant none-the-less: Here are the parts involved. -2x2x16ga mild steel tube -an UZI barrel nut $12 -7ga laser cut baffle flats -end cap and UZI nut flange Here is a flat baffle This is the press I built I will be bending the flats in Here is the baffle in my home made die, pre-bend During the bend And the bent baffle If you noticed in the flat, I made the hole in an elipse. It's .443" in its smallest diameter. When the elipse is bent it forms a .443" round hole, as seen below (the shadow gives the hole a weird square look. Chalk it up to a bad camera....sorry): Below you see the UZI barrel nut and flange: Here I am indexing the flange to the nut to the UZI. So that the can will square up to the sexy squareness of the UZI!!!! You might notice the serial number on the 'inside' of the can. I stamped it backwards...like a moron. So I just stamped it correctly on the other side and figured no one would see 'this', but you did, so .....durn it.... :) Pre-pressed: Post press. Barrel nut side Welding of the barrel nut to the flange Welded The next step I took was stacking and aligning the baffles. Sorry about the blurry pix. This whole post was shot on my phone. I had a threaded rod that I stacked all the baffles on. Here are the baffles staggered and stacked Heres a side view of the stack I made a square fixture that the stack rested in, and was compressed by the threaded rod. The baffle you see at the end of the stack was just used to square the whole assembly. Then i hot tacked all the unions and waited for the assembly to cool so alignment wouldn't change Front view of stack after cooling. I cleaned all BB's up and chased back the hot tacks flush with the stack. I burned HEAVY, so the stack is pretty frickin solid on its own After chasing the welds on the baffle stack, I measures all the unions I would be welding. I then drilled the tube with these locations I then inserted the stack Here you can see the unions I will be welding through the plug holes All plug holes welded! Chased back all the external welds and D.A.'ed! Here is the END of the can So up until now it's all been gravy. Now I am going to weld the finished can together to the UZI. I made a cutout carboard sheild that would cover the gun during the process What I did was weld a small shelf to my vise that the UZI rested on.I wrapped the cardboard over the barrel nut, and cradled the can in the vise. I got an 11/32" piece of drill stock that I inserted into the UZI's barrel that I used during this whole alignment process. Once I aligned the bore, to the baffles I welded everything together, starting with the nut flange at the bottom. Here you can see the drill stock in the receiver And through the assembly Once that was hard tacked into place I added the end cap. All the adjustments Were made while the assembly was attached to the UZI. Welded end cap Barrel nut end chased Exit hole chased and D.A.ed Finished barrel nut end! And there you have it. Be gentle.... :)

Nice.

Range Report!

How much does that thing weigh?

Looks fun!

pretty lol

Wish I had your skills and tools there...



What does it weigh in at?

About 36ozs   on top of the 9lb UZI!!!

Check out the You tube link at the top of the thread

damn, that was made with mild steel, I bet that weights twice as much as the gun itself. lol



ETA: NVM, 16 guage steel.

Cool...

How do you take it apart to clean it?  

Did you build a hoist to lift it too ?

WTF does that thing weigh ?


Major points scored for the metal fab.

this is the coolest post I have read, to date, on ARFcom

I really wish I was good enough to build something like that!

Bravo, sir.

Nice.  Nothing to wear out in that design either really?

You know when they say "this thread is worthless without pics"?
This one is not...

Nice work

That's pretty damn cool.

tag for video

Lazy Link

Damn good job by the way. I like it. Was this your first?

It's built like a Flowmaster race muffler.

Very nice work!

Can't get link to worky.  I can't get that to work so now you know why I don't even try to build anything

Its a monolithic design. It does not come apart. To clean it I just hose out the inside with gun scrubber!
Total cost of the build:

$200 tax stamp for the SBR'ed UZI
$12 for the UZI barrel nut
$200 for the supressor tax stamp

Total build time 2 hours


TAA DAAAA!!!!!

Total build time was 2 hours?  If would take me that long just to drill a couple of holes!

DAMN that is quiet.

You Sir, Rock! that is awesome!

+1

Very nice

love the saying on your press BTW

I think ARFcom should officially award you 10 internets. All in favor?

Totally awesome.  Great reporting and write up too.

Whats an 'internet'?

You should be proud.
American made.
I bet its quiet and keeps the barrel from rising.

IMPRESSIVE and AWESOME.

Nice! I'll take eight of them.

AYE!!

-Tim S.

Only problem is that is bare mild steel. You didn't put any protective paint or anything on it. That will rust very easily.

That is bad ass!

Its getting parked soon!

Cool

Bad ass.

I was going to say...that is something easily remedied.  



 

I thnk it would look cool rusted.  Like something off a road warrior movie.

indeed



I like the quiet hollow metalic ping sound that it's making when fired

Nice, I love thiese type of threads. Great post and great video.

Awesome work.  Very, very awesome.

Some very nice work!  Thanks for sharing!

Totally kick ass post!  I thoroughly enjoyed the pics and write up.  And, Damn!  That thing is pretty freaking quiet!  Good job.

That "PING" you hear is actually the carrier slamming into battery inside the UZI. The noise seems to have been amplified by the supressor being steel too. When I hold the can while firing it its REALLY quiet!! I'm thinking of making a kevlar sleeve like on those MAC 10 supressors!!!

Epic F 'n win

Wow, that is a great job!

damn, that IS quiet.