Build Pictures: 300 Blackout, Ti and 17-4PH

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daPhoosa
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Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

Hello all,

Here are some pictures from my recent F1 build. For those interested, the stamp took 3.5 months.

Here's a link to my previous discussion while I was designing it: viewtopic.php?f=10&t=136138

The cross section as designed looks like this:
Image

My goal was to design a low weight can with reasonable sound reduction. The red muzzle device and orange outer tube create a sealed blast chamber to reduce the peak pressure exerted on the baffle stack. Each baffle has an outer radial expansion chamber.

I made the muzzle device from 17-4PH stainless. I also made a blast shield from Titanium for times when the can is not mounted.
ImageImage

The first baffle is made from 17-4PH stainless, all of the other baffles are titanium. I machined each baffle in a single operation from bar stock. Here you can see a baffle just before the the cone is clip is cut.
Image
Once the baffle is parted off, it is complete. Since all of the critical dimensions are made at once, the alignment is nearly perfect.

Here are all of the parts complete:
Image
Also in the picture is the hand wrench I made for tightening the end cap. I put an 1/2" square drive in the center of it, just in case it gets way tighter than I expect and I need to loosen it.

All seven baffles stacked on top of each other:
Image

The baffles stacked inside of the outer tube:
Image

Fully assembled with end cap installed:
Image

Weight not including the muzzle device is 9.5oz (270g):
Image

Bead blasted exterior:
Image

My SBR with it installed:
Image
Image

My SBR with the can removed and blast shield in place:
Image

I expect that I will paint it black with VHT or a high temp Cerekote, although the matte champagne of bead blasted Ti is growing on me...

I got out and fired it today. With subsonic it seemed to be very ear safe. Supersonic was probably not. I have no other cans to compare it to, so I have no way to determine how good this units actually is. My impression of first round pop was that is seemed very low, but I should do some dedicated testing to see if that's actually the case. I put roughly 130 rounds through it of both supers and subs and it seemed to work great. I'm happy with it.

Please let me know if you have any questions.

Phil

Edit:
Added this from my post below to make it more visible.

Here's a download link for a video of me shooting this suppressor.

Notes:
  • 1.) I recorded with both a head mounted action camera and an action camera from the side, I accidentally stepped back before shooting so I wasn't as visible from the side as I would have liked. It was still a good perspective on sound from in front of the suppressor. Both cameras were in open mounts to prevent blocking the mic holes.
    2.) The first round pop was more significant than I remembered, but not as loud as supersonic rounds.
    3.) I allowed the trigger to reset immediately after firing which caused it to blend/confuse the shot noise. If I was doing it again I'd hold the reset a little longer.
    4.) I would like to test it in an more open area as I think it would sounds even better.
    5.) After FRP, Subsonic sounds really good to me. I would love to be able to compare it to a good commercial can on another 8.5" 300Blk SBR. I don't think it quite qualifies as "Hollywood", but I think it's close and I'm very happy with it.
    6.) Gas blow back didn't seem bad at all even when firing moderately fast supersonic strings.
    7.) I disassembled the can after 130 rounds and it had a layer carbon on all of the baffles, but everything looked perfect otherwise.
    8.) I forgot to record un-supressed shots. Sorry.
Video Download Link
Last edited by daPhoosa on Fri Nov 13, 2020 11:36 am, edited 3 times in total.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
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whiterussian1974
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by whiterussian1974 »

Beautiful work! I doubt that Commercial Mnfrs could make one that's prettier.
I agree about the blasted champagne. Very pretty finish. You can always Cerakote later if you get tired of it.
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
silencertalk.com/forum/viewtopic.php?f=10&t=135314
propeine
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by propeine »

daPhoosa wrote:Hello all,

Here are some pictures from my recent F1 build. For those interested, the stamp took 3.5 months.

Here's a link to my previous discussion while I was designing it: viewtopic.php?f=10&t=136138

The cross section as designed looks like this:
Image

My goal was to design a low weight can with reasonable sound reduction. The red muzzle device and orange outer tube create a sealed blast chamber to reduce the peak pressure exerted on the baffle stack. Each baffle has an outer radial expansion chamber.

I made the muzzle device from 17-4PH stainless. I also made a blast shield from Titanium for times when the can is not mounted.
Image

Image

The first baffle is made from 17-4PH stainless, all of the other baffles are titanium. I machined each baffle in a single operation from bar stock. Here you can see a baffle just before the the cone is clip is cut.
Image
Once the baffle is parted off, it is complete. Since all of the critical dimensions are made at once, the alignment is nearly perfect.

Here are all of the parts complete:
Image
Also in the picture is the hand wrench I made for tightening the end cap. I put an 1/2" square drive in the center of it, just in case it gets way tighter than I expect and I need to loosen it.

All seven baffles stacked on top of each other:
Image

The baffles stacked inside of the outer tube:
Image

Fully assembled with end cap installed:
Image

Weight not including the muzzle device is 9.5oz (270g):
Image

Bead blasted exterior:
Image

Engraving:
Image

My SBR with it installed:
Image
Image

My SBR with the can removed and blast shield in place:
Image

I expect that I will paint it black with VHT or a high temp Cerekote, although the matte champagne of bead blasted Ti is growing on me...

I got out and fired it today. With subsonic it seemed to be very ear safe. Supersonic was probably not. I have no other cans to compare it to, so I have no way to determine how good this units actually is. My impression of first round pop was that is seemed very low, but I should do some dedicated testing to see if that's actually the case. I put roughly 130 rounds through it of both supers and subs and it seemed to work great. I'm happy with it.

Please let me know if you have any questions.

Phil
Beautiful. Makes me want to do something similar for a stubby 223 sbr attenuator.
300sniper
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by 300sniper »

That turned out really nice!
It's time to switch to whiskey, we've been drinkin' beer all night.
fastfire
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by fastfire »

NICE!
Me not being a schooled machinist, what type of cutting tool was used.
I don't recognize the two (tools) when shown machining.
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

fastfire wrote:NICE!
Me not being a schooled machinist, what type of cutting tool was used.
I don't recognize the two (tools) when shown machining.
The tools in the picture are the endmills used to mill the radial ports and cone clip. The endmills are in heat shrink extensions. The turning was done with an assortment of carbide inserted turning tools (out of view). For those curious, the machine is a Haas ST-30SSY.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
quiettime
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by quiettime »

daPhoosa wrote:Weight not including the muzzle device is 9.5oz (270g):
Not bad for a Form 1 :lol:

Very nice work and kudos for building something a little different
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curtistactical
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by curtistactical »

Nice work! Nice machine too, hard to beat a live tool lathe for baffle work :D
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daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

Here's a download link for a video of me shooting this suppressor.

Notes:
  • 1.) I recorded with both a head mounted action camera and an action camera from the side, I accidentally stepped back before shooting so I wasn't as visible from the side as I would have liked. It was still a good perspective on sound from in front of the suppressor. Both cameras were in open mounts to prevent blocking the mic holes.
    2.) The first round pop was more significant than I remembered, but not as loud as supersonic rounds.
    3.) I allowed the trigger to reset immediately after firing which caused it to blend/confuse the shot noise. If I was doing it again I'd hold the reset a little longer.
    4.) I would like to test it in an more open area as I think it would sounds even better.
    5.) After FRP, Subsonic sounds really good to me. I would love to be able to compare it to a good commercial can on another 8.5" 300Blk SBR. I don't think it quite qualifies as "Hollywood", but I think it's close and I'm very happy with it.
    6.) Gas blow back didn't seem bad at all even when firing moderately fast supersonic strings.
    7.) I disassembled the can after 130 rounds and it had a layer carbon on all of the baffles, but everything looked perfect otherwise.
    8.) I forgot to record un-supressed shots. Sorry.
Video Download Link
Last edited by daPhoosa on Thu Mar 10, 2016 12:19 am, edited 1 time in total.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

quiettime wrote:
daPhoosa wrote:Weight not including the muzzle device is 9.5oz (270g):
Not bad for a Form 1 :lol:

Very nice work and kudos for building something a little different
Thanks!
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

curtistactical wrote:Nice work! Nice machine too, hard to beat a live tool lathe for baffle work :D
Thanks. Using that machine feels like cheating... but I'm not complaining. ;-)
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
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Wicked
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by Wicked »

Very nice! Well thought out design and machining is of the highest order.
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quiettime
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by quiettime »

daPhoosa wrote:Here's a download link for a video of me shooting this suppressor.
Where are you located? Background in the vid looks like my neck of the woods
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

quiettime wrote:
daPhoosa wrote:Here's a download link for a video of me shooting this suppressor.
Where are you located? Background in the vid looks like my neck of the woods
Roughly an hour north of Minneapolis MN and right on the border with Wisconsin.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

Wicked wrote:Very nice! Well thought out design and machining is of the highest order.
Thanks!
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
quiettime
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by quiettime »

daPhoosa wrote:
Roughly an hour north of Minneapolis MN and right on the border with Wisconsin.
Ha! Well it looks like pretty country. Enjoy the next 6 weeks :lol:
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

quiettime wrote: ...
Ha! Well it looks like pretty country. Enjoy the next 6 weeks :lol:
Thanks! It was 40 out when I did that video. I should have been up to my knees in snow and 15. It was nearly 70 today. Heatwave. I'm not complaining.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
JFettig
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by JFettig »

daPhoosa wrote:
quiettime wrote:
daPhoosa wrote:Here's a download link for a video of me shooting this suppressor.
Where are you located? Background in the vid looks like my neck of the woods
Roughly an hour north of Minneapolis MN and right on the border with Wisconsin.
Hey, If you want to meter it, contact me :) I'm in Blaine.
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whiterussian1974
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by whiterussian1974 »

daPhoosa wrote:Video Download Link
Did anyone else notice that the Sidecam sounded like a higher pitch and sometimes a bit louder?
I don't know if they both used the same mics, but if so it shows how the can directs sound away from shooter and also how Doppler Shift comes into play. The Bullet's bow wave is only observed to Front and Side. It travels oblique to line of travel.
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
silencertalk.com/forum/viewtopic.php?f=10&t=135314
Historian
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by Historian »

daPhoosa, incredible and enviable machining talent.

Visual eye candy.


Thank you.
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by plodder »

Historian wrote:
Visual eye candy.


.
Is there another kind of eye candy :?
Still awaiting an original & riveting thought for signature line; stand by...........
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by dagamore »

very well done, even the video was well thought out and well done.

My only question, any video of the baffles being made?
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whiterussian1974
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by whiterussian1974 »

whiterussian1974 wrote:
daPhoosa wrote:Video Download Link
Did anyone else notice that the Sidecam sounded like a higher pitch and sometimes a bit louder?
I don't know if they both used the same mics, but if so it shows how the can directs sound away from shooter and also how Doppler Shift comes into play. The Bullet's bow wave is only observed to Front and Side. It travels oblique to line of travel.
THread Author: Are my observations accurate or were they just mic differences?
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
silencertalk.com/forum/viewtopic.php?f=10&t=135314
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

whiterussian1974 wrote:
whiterussian1974 wrote:
daPhoosa wrote:Video Download Link
Did anyone else notice that the Sidecam sounded like a higher pitch and sometimes a bit louder?
I don't know if they both used the same mics, but if so it shows how the can directs sound away from shooter and also how Doppler Shift comes into play. The Bullet's bow wave is only observed to Front and Side. It travels oblique to line of travel.
THread Author: Are my observations accurate or were they just mic differences?
They are two different cameras. The one on my head was a GoPro Hero 3 and the on one the tripod was a Replay XD 1080mini. The 1080Mini is new to me so I'm not sure how it normally sounds compared the GoPro. I didn't stand forward of the muzzle while firing subsonic, so I'm not really sure how it compared being the shooter (which sounded like a solid hand clap).
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
daPhoosa
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Re: Build Pictures: 300 Blackout, Ti and 17-4PH

Post by daPhoosa »

dagamore wrote:very well done, even the video was well thought out and well done.

My only question, any video of the baffles being made?
Thanks!

I don't think there's a way to for me to release any significant amount of footage without exposing technical details which my company considers a trade secret.

Here's the basic steps:
1.) Face bar stock
2.) Drill and bore ID complete
3.) Turn a majority of the OD complete
4.) Drill ports in spacer
5.) Turn remaining OD complete
6.) Mill cone clip
7.) Part off completed baffle
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
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