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1/25/2018 7:38:29 AM
Posted: 3/1/2002 11:38:49 AM EST
Just want to know the legal way to convert a preban threaded barrel to accept a muzzle break pinned and welded ?
Link Posted: 3/1/2002 5:06:38 PM EST
DEPARTMENT OF THE TREASURY Bureau of Alcohol, Tobacco and Firearms Washington, D.C. 20226 JUN 18 1998 F:FPD:FTB:RAT 3311 Dear Mr. : This refers to your letter of March 31, 1998, in which you ask about permanently attaching a muzzle device to various firearms. A muzzle device, such as a muzzle brake or barrel extension, which is attached to a barrel by means of welding or high temperature silver solder having a melting point of at least 1,100 degrees Fahrenheit, is considered to be part of the barrel for purposes of measurement. A seam weld extending at least one-half the circumference of the barrel or four equidistant tack welds around the circumference of the barrel are adequate for this purpose. A firearm having a muzzle brake, cap, or barrel extension permanently attached by those same methods to cover the threads on a barrel, would not be considered to have a threaded muzzle. Please note, however, that any muzzle device or barrel extension which functions as a flash suppressor or grenade launcher would still constitute one of the qualifying features of a semiautomatic assault weapon as that term is defined in 18 U.S.C. section 921(a)(30(B). Industrial adhesive products are not an acceptable method for permanently attaching a muzzle device. - 2 - Mr. We trust that the foregoing has been responsive to your inquiry. If you have further questions concerning this matter, please contact us. Sincerely yours, [signed] Edward M. Owen, Jr. Chief, Firearms Technology Branch
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Link Posted: 3/2/2002 4:18:36 AM EST
Originally Posted By JARHEAD_BOB: Just want to know the legal way to convert a preban threaded barrel to accept a muzzle break pinned and welded ?
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You answered your own question,,,,Thread on the brake, pin it, and weld over the hole for the pin. refinish as needed, all done and legal.
Link Posted: 3/2/2002 6:03:37 AM EST
What exactly is pinned an welded ? And, how do you put a pin through a barrel that a bullet travels through ?
Link Posted: 3/2/2002 7:18:22 AM EST
[Last Edit: 3/2/2002 7:23:26 AM EST by SBR7_11]
I have cut (2) 5.5's from 11.5" barrels to get my short barrels. The Bushmaster 11.5/5.5 I had was drilled throught the suppressor in 2 places, and slightly into the threads, just enough for the pin to engage/pin the barrel-suppressor together. Then the hole is welded shut to prevent easy removal of the pins. If you tried to turn the 5.5" off, it would be difficult, and mess up the end of the barrel. The Oly was done in a similar fashion, but similar to the way the front sight post pins pass through the perimeter of the barrel, then holes welded shut. Oly used a larger pin than Bushmaster, where as Bushmaster just drills a somewhat straight into the barrel surface and installs a pin and welds holes shut. An option to welding is to contact [url]www.Gem-Tech.com[/url]( the suppressor people), as I understand they can do Laser Welding, look into that as opposed to hitting end of barrel with "TIG" or "MIG" or torch.
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