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View Full Version : Legal: ATF letter on blind pin/weld of muzzle brake installation


Circuits
January 15, 2003, 20:41
DEPARTMENT OF THE TREASURY
BUREAU OF ALCOHOL, TOBACCO AND FIREARMS
WASHINGTON, DC 20226

FEB 2 2000

903050:EMO
3311

Mr. XXXX XXXXXX
XXXXXX XXXXXX
XXXX XX XXX
XXXXXXXXXX, XXXXXXXX XXXXX

Dear Mr. XXXXXX

This is in reply to your letter dated December 28,
1999, in which you ask about permanently affixing
muzzle brakes your firm produces to barrel muzzles
of "post ban" AR15 type rifles.

You indicated that the barrel muzzle will be threaded
to accept the muzzle brake. The brake will be screwed
to the barrel muzzle and a 3/32 inch hole .030 - .050
inches in dpeth will be drilled into the barrel wall
using an existing set screw location in the brake as a
pilot hole. A 6X32 TPI set screw will be installed
through the pilot hole and into the described blind
hole in the barrel. The set screw hole will be welded
over after installation of the screw to permanently
affix the brake to the barrel. Excess wild will be
removed and the muzzle brake refinished to conceal the
location of the weld.

The above described procedure has previously been
approved for use in permanently affixing muzzle
attachments to rifle barrels. An AR15 type rifle
barrel having a muzzle brake affixed as described
above would no longer be considered to have a threaded
muzzle provided that deep penetrating steel fusion
welding is used.

W.E.G.
January 15, 2003, 20:48
Can you cite the source for this letter?

Where is it published? Who is the author?

Circuits
January 15, 2003, 21:25
I printed it out from the Wilson Combat website back in April 2000.
The source is the ATF, in response to a letter about the attachment method from Wilson Combat.
The author is Edward M. Owens (hence the EMO at the top) the now-retired head of ATF Firearms Tech Branch.

I'll send a scan of the original printout to James Bardwell to include in his ATF letter archive, since this one never seems to have made it there before now.

W.E.G.
January 15, 2003, 21:52
Originally posted by Circuits
I'll send a scan of the original printout to James Bardwell to include in his ATF letter archive, since this one never seems to have made it there before now.

That web site is at http://www-2.cs.cmu.edu/afs/cs/user/wbardwel/public/nfalist/law.html