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Discussion Starter · #1 ·
To All,

Would someone be able to describe for me the pinning method that Bushmaster currently uses for fixing the "State Compliant” Muzzle Brakes on to the ACR barrels ?
I called in to Bushmaster Customer Support and a technician stipulated that it was pinned horizontally under the barrel transfixing the threads from 5 O’clock to 7 O’clock .

In another thread it was stated that there are “Two” pins at the 6 O’clock and 12 O’clock positions.

I would like some clarity here before I engage a Gunsmith to replace the “Izzy Brake” with one of my choosing.

Thank you for any information you can provide that would clarify this for me.

Fenrir17
 

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My FFL guy had made the mistake of ordering me the "State compliant model".... I was so fired up to get the gun I didn't realize the mistake until the next day. Needless to say - I wanted it "fixed" ASAP.
My gunsmith put the barrel in a lathe and just started to turn down the Izzy until the pins were revealed, then punched them both out. He did say there were two, but did not relay at what position they were at. This caused some minor damage to the threads on the barrel, but nothing that prevented mounting of a flash hider. Charged me $30.
 

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Discussion Starter · #3 ·
JohnnyK,

Thank you for taking the time to respond to this request. it is much appreciated. I spent some time looking for others that may have touched on this subject and I found the following posts on other forums about this subject. See Bellow -


Here's the exact wording from Bushmaster on that issue, cut and pasted word for word:
Hello,
Subject: Muzzle Brakes & Flash Hiders, permanently attached.


Bushmaster muzzle brakes and flash hiders that are permanently attached are done so in the following manner ; The unit is threaded onto the barrel, blind hole drilled in two places into the threads, holes are pinned, pins are welded over, welds are ground flush and the complete barrel assembly is then sent to finish.
Free float hand guards that replace the barrel nut can not be installed on these barrels.
In order to remove the unit without damaging the muzzle the pins must be drilled or ground to below the threads before removal of the unit. This will usually damage the flash hider or brake so that it can not be reused. The threads of the muzzle may still have some damage that would require chasing with a die before replacing the flash hider or brake.
In order to bring the barrel back to legal length the replacement flash hider or brake must be long enough to bring the total length to 16" or longer overall length. It must also be permanently attached according to BATF standards by high temperature silver soldering or pinning and welding. An A2 bird cage is not long enough to do that. The Phantoms and Izzy flash suppressors are long enough.
Bushmaster is not set up to do individual piecework on barrels so it would need to be done by a gunsmith shop or a machine shop.

also found :
it is removeable... i know that for a fact, i did mine 1 year or so ago. Heat it up with a torch and then put a wrench to it and the pins will snap and you can screw it right off. Then run a die over the threads and chase them true ( i can check the size die if you need me too) and then your good to go. Add your new 1.5-2" brake and silver solder in place with a new lock washer and your back in the fight.

I have not talked with a gunsmith from Bushmaster yet. I intend to get as much factual information as possible before beginning the project of muzzle brake replacement.


Fenrir17
 

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Discussion Starter · #4 ·
Update:

So I called Bushmaster "Customer Support" Today and asked them if they could verify the positioning and number of pins that are currently being used on the State Compliant ACR barrel build outs.
I was told by a Customer Support Agent that the PIN is a "Single" pin inserted horizontally from 3 to 9 O'clock at the 6 O'Clock position on the bottom of the barrel. I was told that a gunsmith would have to go looking to find it.
I asked if I could speak with a gunsmith who assembles the barrels, and or could I request by email for a more input from someone with more knowledge who would be able to describe in more detail the pinning procedure - I was denied.

My strong opinion is that no one at Bushmaster Customer Support is able to, Or is told not to reveal accurate information as to the pinning method.

I am not trying to be a pain in the arse about this. It's just the fact that i want to get the job done correctly, safely and just done right !

I will most likely give the information that JohnnyK provided to me to the Gunsmith I go to.
Or
I am also seriously tempted to get a Dremmel tool, some cut of discs and slowly work my way to cut , discover the pins, remove them and split the brake off the threads as others have done.

Your Opinions ?
 

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Discussion Starter · #5 ·
Update : 6/11/11

I made the decision to have the BM Factory pinned & welded brake replaced with the BC 1.5 SS brake. I wrapped up the barrel assembly and shipped it to Adco firearms LLC. this morning. ( Finding a Gunsmith in the North East NJ area is futile. )

Battle Comp 1.5 SS Brake - $155
Cost : $40 to remove brake, $40 to install new brake pinned and welded.
$10 shipping, $4 Shipping tube, and whatever return shipping is going to cost.


My Thanks to the Great State of New Jersey for its draconian State firearm laws !


My Sincere thanks to those who took the time to read this thread and respond.

Fenrir17
 

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You are welcome from the great state of Mississippi where if it goes bang, you can have it

Sent from my DROID PRO using Tapatalk
 

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I'm having my tig welded on. The guy is going to blow nitrogen thru the barrel while he does it. Heat will only affect the exact area of the weld, not the barrel.
 
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