Monobaffle can - almost done - pics

Yes, it can be legal to make a silencer. For everything Form-1, from silencer designs that are easily made, to filing forms with the BATF, to 3D modeling. Remember, you must have an approved BATF Form-1 to make a silencer. All NFA laws apply.

Moderators: mpallett, bakerjw

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Monobaffle can - almost done - pics

Post by GeneT » Tue Dec 09, 2008 11:31 pm

Well, here's the monobaffle design I proposed, almost done (just have to drill the mouse holes). I'm not sure the first chamber was clear, so here's a pic with the barrel in place.

Image

GsT
50 BMG Site:
www.hevanet.com/50shooter

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Tue Dec 09, 2008 11:34 pm

And the full meal deal. I may add a weight to the stock to get the thing to balance better, but it points well. I think it looks extra long in the pic, perhaps due to the diameter being close to the handguard diameter, or perhaps because the scope is such a short, but it's really not that bad.

Image

GsT
50 BMG Site:
www.hevanet.com/50shooter

dave22
Silent But Deadly
Posts: 187
Joined: Wed May 07, 2008 11:37 pm

Post by dave22 » Tue Dec 09, 2008 11:42 pm

Very nice work. Looks great.

Only thing that would make it look cooler would be to SBR it, that is a whole new hassle but I had to say it.

I like the way the dia matches the handguard.

I think it will sound great too.

Dave

HandyMan
Silent But Deadly
Posts: 1095
Joined: Sat May 28, 2005 11:23 pm

Post by HandyMan » Tue Dec 09, 2008 11:58 pm

Really nice machine work. I may have to try this design. It has promise.

User avatar
MCASSgt New River
Silent But Deadly
Posts: 598
Joined: Sat Feb 02, 2008 1:02 pm
Location: Richlands, NC
Contact:

Post by MCASSgt New River » Wed Dec 10, 2008 1:55 am

Looking forward to a range report in the near future!! :twisted:
LOOKS GOOD!
A veteran is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America' for an amount of 'up to and including their life.'-That is Honor

V8Astro
Silent But Deadly
Posts: 243
Joined: Mon Sep 17, 2007 7:30 pm

Post by V8Astro » Wed Dec 10, 2008 10:00 am

That looks great! I plan on building one like that in the future...

User avatar
Wyatt9k
Silent But Deadly
Posts: 588
Joined: Sun Dec 30, 2007 9:50 pm

Post by Wyatt9k » Wed Dec 10, 2008 6:45 pm

MCASgt New River wrote:Looking forward to a range report in the near future!! :twisted:
LOOKS GOOD!
yes+vid if u can too

Mageever
Silent But Deadly
Posts: 488
Joined: Sun Jan 08, 2006 11:03 pm

Post by Mageever » Wed Dec 10, 2008 7:48 pm

Very cool! I've always thought this design would work better in a rifle where you're not constrained so much by the tube size and bore diameter. In other words, you're able to make decent sized chambers and offset them well without running into the bore centerline.

I'm not quite understanding how it attaches to the barrel. Do you have the barrel threaded back under the handgaurd and then turned down to fit into the core? Also, are there mouseholes to the secondary chambers yet?

Good work!!

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Wed Dec 10, 2008 9:05 pm

The barrel is threaded just in front of the handguard. Right under the nut / thread protector in this pic:

Image

Mouseholes are going in tonight and that'll be it.

Saturday will be my earliest opportunity for a range test, and if it's quiet enough on the range I'll do a video as well.

GsT
50 BMG Site:
www.hevanet.com/50shooter

User avatar
wolf
Silent But Deadly
Posts: 2591
Joined: Wed Nov 22, 2006 12:32 pm

Post by wolf » Wed Dec 10, 2008 9:41 pm

How is the weight compared to a factory model of same length

That thing is begging for a bipod :twisted:

User avatar
chingon
Silent But Deadly
Posts: 488
Joined: Sun Sep 16, 2007 6:34 pm

Post by chingon » Wed Dec 10, 2008 10:49 pm

Nice

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Thu Dec 11, 2008 12:18 am

wolf wrote:How is the weight compared to a factory model of same length

That thing is begging for a bipod :twisted:
I haven't got a clue. I'll weigh it when it's done, but I don't have a 'factory' weight to compare it to. This is my first can.

GsT
50 BMG Site:
www.hevanet.com/50shooter

SP95
Member
Posts: 15
Joined: Sun Aug 17, 2008 11:24 pm

Post by SP95 » Thu Dec 11, 2008 1:06 am

Looks real good I will be interested in your results. Something that might extend the life of your blast chamber and possibly help suppression would be to mill a muzzle brake into the barrel which would be pretty hard to do(mainly crowning the barrel), but you could cut the barrel back and thread it and buy or make a muzzle brake the same diameter of the barrel. Just a thought.

Mageever
Silent But Deadly
Posts: 488
Joined: Sun Jan 08, 2006 11:03 pm

Post by Mageever » Thu Dec 11, 2008 1:17 am

Groovy, thanks for sharing that. I'm sure it's going to sound pretty good!

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Thu Dec 11, 2008 2:11 am

Well it's 'done' - unless there are baffle strikes or something like that. Right now the can weighs 4.25 lbs (heavier than I would have guessed, but balance has a lot to do with it). Mouseholes are cut 5/16" such that they meet the bore in a figure 8. The very first partial radius got a straight hole. I contemplated one of the 'whistle cuts' Conqueror showed in another thread, but the arrangement was such that it wouldn't work here.

The execution went according to plan, the final bit satisfies me in terms of looks (although the markings could look a lot better) and I certainly hope that a big can like this will be effective, but will have to wait until Saturday to find out.

Range report coming when I 'can'. :twisted:

GsT
50 BMG Site:
www.hevanet.com/50shooter

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Thu Dec 11, 2008 2:12 am

Crap! Sorry, forgot the image I meant to attach. Hopefully this, coupled with the others will adequately describe what I've done.

Image

GsT
50 BMG Site:
www.hevanet.com/50shooter

JFettig
Senior Silent Operator
Posts: 104
Joined: Wed Nov 28, 2007 8:51 pm

Post by JFettig » Thu Dec 11, 2008 10:59 am

What was your method of cutting all the holes?

Did you just drop a great big end mill down in there, or did you bore them or use smaller end mills and a cnc or..?


Jon

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Thu Dec 11, 2008 11:11 am

Just 'dropped' a big ol' endmill through them. Running about 40 rpm.

GsT
50 BMG Site:
www.hevanet.com/50shooter

User avatar
PTK
Silent But Deadly
Posts: 2161
Joined: Thu Mar 20, 2008 12:36 am
Location: Bozeman, Montana

Post by PTK » Thu Dec 11, 2008 11:40 am

That's one beefy silencer.
RIP Dave. You will be missed.

User avatar
pneumagger
Silent But Deadly
Posts: 3455
Joined: Mon Jul 23, 2007 9:09 am
Location: N.E. Ohio

Post by pneumagger » Thu Dec 11, 2008 11:43 am

be sure to get a range video when you go :)
What kind of michine did you use.
I reject your truths and substitute my own realities

User avatar
jimmym40a2
Elite Member
Posts: 2745
Joined: Sun May 06, 2007 9:25 pm
Location: Colorado (for Mongo)

Post by jimmym40a2 » Thu Dec 11, 2008 12:25 pm

Great job......
http://www.youtube.com/watch?v=nEZJ_C4LwzA

User avatar
Trex
Silent But Deadly
Posts: 271
Joined: Tue May 29, 2007 8:40 am

Post by Trex » Thu Dec 11, 2008 3:20 pm

Looking good Gene but I have never seen anything with the muzzle that close to the blast baffle. I had imagined the muzzle being further back. I dont know if this will have any effect on accuracy or muzzle erosion over the long term. I suppose only testing and time will tell - but am keen to see the result accuracy wise.

I was thinking if it did fling bullets over the place (so to speak) then you could maybe cut the first baffle in a similar manner to the SAK rimfire, the first baffle wall has a slot cut right across it removing the borehole. I dont have mine to hand but this can be seen in the Invisible Scarecrows video. The other option would maybe to drill through the threaded mount end and enlarge the hole to the maximum possible allowed by the mounting threads. the SAK approach seems less bother. I'm assuming the barrel cannot be cut back due to becoming SBR?

http://uk.youtube.com/watch?v=zesohoN98 ... annel_page

Always nice to see another Silencer born and I hope that testing goes well for you - probably the case that the above will not an issue, more a comment and thought than anything else.

User avatar
Baffled
Silent But Deadly
Posts: 962
Joined: Thu May 19, 2005 4:20 pm

Post by Baffled » Thu Dec 11, 2008 7:15 pm

Gene, that is a sweet job. I hope it performs to your expectations, and I'll bet it will.

As for a muzzle close to the blast chamber, mine darned hear hangs into it, and FRP is very low. I'm not sure what effect those oblong annular spaces will have on either side aft of the barrel muzzle... they could work great, or the volume may contribute to FRP. 300 whisper, correct? Is this the first centerfire staggered-chamber monocore built?

Don't mean to be a nitpicky jerk, but is there a big burr on the muzzle of tthe barrel? Maybe it's a trick of lighting, and there is in fact a target crown there!

User avatar
GeneT
Silent But Deadly
Posts: 200
Joined: Sun Mar 23, 2008 1:30 pm
Location: Albany, OR

Post by GeneT » Thu Dec 11, 2008 9:03 pm

Why you nitpicky jerk! :D Yes, that is a big ol' burr. I bunged the crown pretty neatly shortly after I built the rifle and tried to remedy it in rather sleazy fashion with hand tools, resulting in the burr. So it needs a re-crowning, just haven't done it yet.

Yep it's 300 Whisper (or 300-221).

Trex I can lop off another 1/2" without going SBR, but I probably wouldn't do more than 3/8". (I like to leave no doubt...)

Off to load for the maiden voyage...

GsT
50 BMG Site:
www.hevanet.com/50shooter

User avatar
Casca
Silent Operator
Posts: 77
Joined: Sun Oct 26, 2008 6:25 pm
Location: Oakland, TN

Post by Casca » Fri Dec 12, 2008 12:38 am

looks great - can't wait for the range report!

Where did you get the 300 barrel/upper?

Post Reply