Quoted: How is the law worded that the solder melting temp must be 1100 degrees?
|
It was an ATF opinion letter that stated welding or 1100 degree silver solder was an acceptable method for attaching a muzzle brake or barrel extension. The whole point of using 1100 silver solder is so it can't be removed with an ordinary propane torch.
www.cs.cmu.edu/afs/cs/user/wbardwel/public/nfalist/atf_letter40.txt"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."