Quoted: I had my dad silver solder a 4" flash supressor onto a custom 12" to make a legal 16" comando. But after I took it shooting the heat loosened it up. Is there anything else that works for this kind of project?
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If the heat from shooting is loosening up the solder you used, you are using the wrong stuff or doing it wrong and you have an illegal configuration. You have a SBR with a nonpermanently attached FH, unless, of course you have a properly registered SBR, but then the soldered FH wouldn't make much sense.
The solder you are supposed to use it silver solder paste. It must have a melting temp of 1100 degrees F or greater. A MAPP gas or oxy/acetylene torch is required to properly silver solder on a FH.
Get it fixed correctly and quickly or disassemble the upper.
If you used silver solder, you either didn't heat up high enough, or you didn't maintain the heat long enough for the solder to flow.