Unknown accessory on used A Bolt Browning

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fyrproof1

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I bought a used A Bolt Browning in 7mm Rem Mag and it has this muzzle break of unknown manufacture on it. Does anyone recognize it? And, more importantly, does anyone who is familiar with the BOSS attachment think that one would screw on to the end of this barrel? It is a Browning barrel, but it doesn't sound like this is a Browning accessory and I don't know if the threads will work with the BOSS-CR (that I am looking at to replace it with). According to the serial number, the gun was made in 1994 -- I believe the first year for the A Bolt II and the BOSS system. Thanks.A Bolt Barrel (2).jpg
 
It looks like a homemade brake... a little ugly and probably quite ineffective compared to others...
 
fyrproof1 said:
Thanks...do you think it was placed there to protect the BOSS threads? Are they BOSS threads?
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It's a brake. I'd guess it was put there to reduce recoil. It'd be hard to answer if the thread were originally for a BOSS from a picture, especially considering that BOSS thread may change with bore size and barrel contours.-Mike
 
Thanks and, of course, you're right...sometimes a picture doesn't say 1000 words. I'm going to call Browning again tomorrow.
 
mwezell said:
It's a brake. I'd guess it was put there to reduce recoil. It'd be hard to answer if the thread were originally for a BOSS from a picture, especially considering that BOSS thread may change with bore size and barrel contours.-Mike
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Actually 1/2 x 28 tends to be the standard for most barrel screw-ons. Check the threads on your barrel
 
Since I doubt we are talking about a 50 Barrett, you are being awfully abrasive. And as I recall the 50's are not circumferential holes. They are more closely related to an M1-A1 tanks type of brake
 
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David Halblom said:
Since I doubt we are talking about a 50 Barrett, you are being awfully abrasive.
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Sorry, David, I didn't mean to be. Obviously it's not a .50. I was just pointing out that the "standard" isn't very standard. I've got a chart somewhere that lists recommended minimums. I prefer not to use 1/2-28 on anything 30 caliber and up. You do need some meat there, and some rounds have more muzzle pressure than others. I've seen a .338 win mag threaded 1/2-28 bulge under the brake. Accuracy was not quite up to BR standards...Customer said he couldn't hit anything with it though and I'd say that was right. --Mike
 
And I was a bit abrupt too. Getting to be the SOP in the web lately. I agree 1/2 x 28 is a bit thin, but it is what 95% of accessories are threaded at. And most are for light stuff. Even a 45 ACP Silencer is light stuff, in the grand scheme of things
 
David Halblom said:
And I was a bit abrupt too. Getting to be the SOP in the web lately. I agree 1/2 x 28 is a bit thin, but it is what 95% of accessories are threaded at. And most are for light stuff. Even a 45 ACP Silencer is light stuff, in the grand scheme of things
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I type terribly and tend to get to the point sometimes w/o thinking about how it comes across....and it doesn't help that I still haven't had time to shoot my first match this year:(.

Back to the op...Browning may be able to tell you what it came with or it should be pretty easy for a smith or machinist to tell you the thread size and pitch, if you don't have the proper tools yourself.--Mike
 
A Bolt with Ruler2.jpgThanks for looking at it. I'm including a second pic in case that helps somebody.
 
David Halblom said:
They are more closely related to an M1-A1 tanks type of brake
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David,

The 120mm cannon on an M1A1 tank has no brake. Thank goodness, as the "BOOM" from the weapon is loud enough as it is.

Reference: http://www.inetres.com/gp/military/cv/weapon/M256.html
Has no muzzle brake or blast deflector.
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The overpressure from the 120mm cannon can kill a dismounted infantryman within a 90° arc extending from the muzzle of the gun tube out to 200 meters.
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You may be thinking of muzzle brakes on the M242 cannon (25mm automatic cannon), used by the Army in M2 and M3 Bradley IFVs; by the US Marine Corps on LAV-25 IFVs; and by the US Navy on shipboard mounts.. Note the brakes on M242s do not match the "arrowhead" or "T" shapes found on many .50 BMG rifles.

References: http://www.inetres.com/gp/military/cv/weapon/M242.html
http://www.navweaps.com/Weapons/WNUS_25mm_mk38.htm
 
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Fyrproof 1
I thank the boss system had some type of rubber bedding system.
Max
 
Thank you for the clarification on the BOSS threads. I just ordered a thread protector and am going to leave it at that.
 
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