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Gunsmithing Muzzle Break ? never seen asked

Pygmycoho1

Private
Minuteman
May 1, 2009
27
0
42
North texas
Why thread the barrel then thread on the break. I know some are made to come off. But lots of them are made to blend in and aren't easily used with a suppressor. Seems like it would be quicker and more accurate to machine it with the barrel as one unit. The bullet would be supported the entire barrel length. But its not done, so why. Most people don't shoot out a barrel but I guess that would be one reason, ability to remove and put on your next barrel.
 
Re: Muzzle Break ? never seen asked

Here in Pennsylvania I do more in the barrel than threaded on. Mostly on hunting guns. I think the biggest reason is a lot of ranges don't allow brakes during competitions.
 
Re: Muzzle Break ? never seen asked

JDJ's "Mag-Na-Port" is a integral brake as you describe. With four ports, it mainly reduces muzzle rise. Which is significant on the big boomer hunting rifles. Without an expansion chamber, the reduction in recoil per-se is only in the 25 to 30 percent range. The EDM process helps to allow venting without harming the bullet due to machining mistakes. If the rifle muzzle is big enough to allow back boring with a clean internal crown and fitting of a proper exit plug with a minimal clearance hole, then it could be done. It is however an easier and less problematical to fit a brake that is machined separately and thread it on. Plus as you pointed out, it can be moved to an replacement barrel.
 
Re: Muzzle Break ? never seen asked

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Definitions of brake on the Web:

a restraint used to slow or stop a vehicle
any of various ferns of the genus Pteris having pinnately compound leaves and including several popular houseplants
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wordnetweb.princeton.edu/perl/webwn
A brake is a device that decelerates a moving object such as a machine or vehicle by converting its kinetic energy into another form of energy, or a device which prevents an object from accelerating.
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Brakes are used on the vehicles of railway trains to slow them, or to keep them standing when parked. ...
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Brake is a surname of English origin and may refer to: * Brian Brake (1927-1988), New Zealand photographer * Patricia Brake (b. 1942), English television actress * Tom Brake (b. 1962), British politician * Colin Brake (b. ...
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Re: Muzzle Break ? never seen asked

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Swedish guy</div><div class="ubbcode-body">It would be sort of expensive to should the smith screw things up a bit too.

Good in theory, is that a nice summary?

/Chris </div></div>

One of the guys in our class did this on a rifle project (.416 Ruger).

He spent a bunch of time boring out the 'expansion chambers' in the already rifled barrel, then milling through to them from the outside.

Obviously, it would take him a lot less time the next time, but...
 
Re: Muzzle Break ? never seen asked

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mark Housel</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Swedish guy</div><div class="ubbcode-body">It would be sort of expensive to should the smith screw things up a bit too.

Good in theory, is that a nice summary?

/Chris </div></div>

One of the guys in our class did this on a rifle project (.416 Ruger).

He spent a bunch of time boring out the 'expansion chambers' in the already rifled barrel, then milling through to them from the outside.

Obviously, it would take him a lot less time the next time, but... </div></div>

Do you know how he managed to get a good crown on the barrel?

Still it´s a bit like shearing a pig, a lot of work for a very small benefit.

/Chris
 
Re: Muzzle Break ? never seen asked

exactly what I wanted to know. Thanks for the info guys.

I never thought of the expansion chamber.
 
Re: Muzzle Break ? never seen asked

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Swedish guy</div><div class="ubbcode-body">
Do you know how he managed to get a good crown on the barrel?

Still it´s a bit like shearing a pig, a lot of work for a very small benefit.

/Chris </div></div>

He did the boring of the expansion chambers with a custom ground tool.

The 'crown' is essentially the opening to the first of the expansion chambers.
So, as he brought the tool out radially to cut the expansion chamber it's like cutting a crown I suppose.

Of course it couldn't be subsequently deburred as it could be at the end of the barrel.

But it would be concentric and square to the bore line which are the most important things as I understand it.

I suppose the rifles purpose as a Dangerous Game rifle that he hopes to take to Africa means that it doesn't need to be sub MOA accurate since the targets are large, and relatively close up.
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