AR flash hider pinning

[ar15barrels]

I'll just drop these here:

[milotrain]

When you weld in the pin, do you typically use gas or MIG?

Good God why would you even think about taking an OA torch to it?! Button rifled barrels are already under a sh*tload of stress, you don't want that kind of HAZ developing at the end of a button rifled barrel.

[DEF23]

Here is that letter that I mentioned above. I have never seen it written like this anywhere else, but it was sent out written as such to this gentleman (back in 98').

Possibly this was written more in reference to weapons being imported at the time to comply with the AWB, which was still in effect. As the current regulations no longer have that particular proviso included in them.

I also remember a few years back when they were saying that blind-pinning wasn't a legal method of attachment also. But apparently that got cleared up quickly.

--------------------------------------------------------------------------

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.

[kcstott]

Here is that letter that I mentioned above. I have never seen it written like this anywhere else, but it was sent out written as such to this gentleman (back in 98').

Possibly this was written more in reference to weapons being imported at the time to comply with the AWB, which was still in effect. As the current regulations no longer have that particular proviso included in them.

I also remember a few years back when they were saying that blind-pinning wasn't a legal method of attachment also. But apparently that got cleared up quickly.

--------------------------------------------------------------------------

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.

BS!!!! they obviously have never tried to remove something screwed on with green locktite. That stuff is chemical welding. the treads with strip before it lets go.

[ar15barrels]

BS!!!! they obviously have never tried to remove something screwed on with green locktite. That stuff is chemical welding. the treads with strip before it lets go.

500 degrees will fully defeat green loctite, rendering it no good.
500 degrees is FAR below the 1100 degree threshold.