Yes, 1100 degrees is the minimum melting temp. Brownell's sell some in a hypodermic type applicator. Just squeeze some out on the barrel threads, screw on the extention and heat to a dull red. It won't work when joining aluminum to steel, though.BCR#1 said:I believe 1100 degrees F minimum. Sweating it on with lead core solder could be easily removed with hand tools, ie, a pipe wrench. ATFE wants the extention to be permanent.