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Thread: Eccentric over barrel rifle suppressors - anyone know?

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Cordite Eccentric over barrel rifle... 27-11-2018, 09:59 PM
Ryan_Songhurst That Rev Rog bloke seems... 27-11-2018, 10:23 PM
madjon_ I think he's dead? 28-11-2018, 06:31 AM
300CALMAN Yes RIP Roger Spackman ... 28-11-2018, 07:02 AM
Max Headroom He looks like an interesting... 28-11-2018, 12:34 PM
madjon_ He liked to drill holes:sick: 28-11-2018, 12:50 PM
300CALMAN No I have only seen the Salvo... 28-11-2018, 07:14 AM
Cordite Yes, the Maxim ones were THE... 28-11-2018, 11:21 AM
gundoc I have made a few eccentric... 28-11-2018, 11:48 AM
Cordite I see, so blast gets... 02-12-2018, 12:26 AM
300CALMAN If I had a lathe etc I would... 02-12-2018, 10:34 AM
Nick-D He made and sold, or at least... 28-11-2018, 01:54 PM
tetawa Rev Rog had different ideas... 28-11-2018, 03:00 PM
Ryan He certainly was quite an... 28-11-2018, 05:49 PM
csmiffy To take a quote from a... 02-12-2018, 09:48 AM
Cordite Got a ~75cm lenght of... 02-12-2018, 11:00 AM
csmiffy SilencerTalk - Index page... 02-12-2018, 11:26 AM
Cordite Yes, strange how the US is so... 02-12-2018, 12:52 PM
hotbarrels I have one on my 357mag lever... 02-12-2018, 05:25 PM
Cordite Nice stainless can. Someone... 02-12-2018, 11:14 PM
Chilli_Dog Sounds like a familiar... 03-12-2018, 07:01 PM
Cordite Yes, prob with long... 03-12-2018, 09:58 PM
Chilli_Dog Mine drilled pretty straight... 06-12-2018, 07:36 PM
Cordite Thanks, just revisited your... 06-12-2018, 11:41 PM
  1. #1
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    Sounds like a familiar design.... mine was 405mm long and 2" dia, it is pretty heavy though, if I get my mits on another barrel I might try for some slots near the muzzle end, or maybe just fluted with ports at the bottom of the flutes. The only tricky bit with your idea is getting the crown sorted depending on how deep you counter bore it, maybe a brass rod that is a good fit for your hole with the end turned/filed/ground to the same angle as the drill bit and some valve grinding paste. Im not really convinced the baffles in mine do anything but I have a lot of relatively small ports

  2. #2
    Member Cordite's Avatar
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    Quote Originally Posted by Chilli_Dog View Post
    Sounds like a familiar design.... mine was 405mm long and 2" dia, it is pretty heavy though, if I get my mits on another barrel I might try for some slots near the muzzle end, or maybe just fluted with ports at the bottom of the flutes. The only tricky bit with your idea is getting the crown sorted depending on how deep you counter bore it, maybe a brass rod that is a good fit for your hole with the end turned/filed/ground to the same angle as the drill bit and some valve grinding paste. Im not really convinced the baffles in mine do anything but I have a lot of relatively small ports
    Yes, prob with long counterbore is keeping it concentric with the bore, or the crown will not be at 90 degrees to the bore either. I think main thing is to counterbore to somewhere where there is good rifling (that is why this rifle is getting chopped), less important to have a beautiful looking crown. Some dude out there did experiments with simply hacksawing a new hunting rifle one inch at a time and shooting the rough end with only obvious burrs removed, no effect detected on accuracy. Anyway, if you use a drill with more of an angle on the cutting edges it's self centering.

    I have an alternative idea taken from overbarrel silencers, where a barrel protector sleeve is often added. You can extend that sleeve forward of the muzzle right to/through the front of the silencer and perforate it to your heart's content. A small barrel counterbore of 2 inches can still be done, with side venting ports, and the sleeve can be perforated over those ports. Baffles can be welded to the sleeve if desired.

    Both solutions seek to address @gundoc's stated/hated no. 1 problem with eccentric suppressors - alignment.

    Name:  sleeve eccentric.jpg
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    Last edited by Cordite; 03-12-2018 at 10:22 PM.
    An itch ... is ... a desire to scratch

  3. #3
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    Quote Originally Posted by Cordite View Post
    Yes, prob with long counterbore is keeping it concentric with the bore, or the crown will not be at 90 degrees to the bore either. I think main thing is to counterbore to somewhere where there is good rifling (that is why this rifle is getting chopped), less important to have a beautiful looking crown. Some dude out there did experiments with simply hacksawing a new hunting rifle one inch at a time and shooting the rough end with only obvious burrs removed, no effect detected on accuracy. Anyway, if you use a drill with more of an angle on the cutting edges it's self centering.

    I have an alternative idea taken from overbarrel silencers, where a barrel protector sleeve is often added. You can extend that sleeve forward of the muzzle right to/through the front of the silencer and perforate it to your heart's content. A small barrel counterbore of 2 inches can still be done, with side venting ports, and the sleeve can be perforated over those ports. Baffles can be welded to the sleeve if desired.

    Both solutions seek to address @gundoc's stated/hated no. 1 problem with eccentric suppressors - alignment.

    Attachment 100111
    Mine drilled pretty straight with a plain old jobber drill, its probably easier to build than the drawing above

  4. #4
    Member Cordite's Avatar
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    Quote Originally Posted by Chilli_Dog View Post
    Mine drilled pretty straight with a plain old jobber drill, its probably easier to build than the drawing above
    Thanks, just revisited your .410 de lisle thread and saw your long 10mm drill construction.

    Yes, think you're right about avoiding the complication of the barrel sleeve. If I index the front and back caps to the outer sleeve I may be able to hold it all together simply with a thread at the end of the barrel. Some de Lisles have a short bit of barrel sticking out front of the silencer and that could be the treaded bit holding a screw-on retaining cap. Sleeve and baffles can be added at will later but the design will work to a degree without such.
    An itch ... is ... a desire to scratch

 

 

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