I'm going to guess you will not find much if any .45 solvent traps threaded at 1/2-28. That would make for a very thin wall on the end of the barrel. .578x28 is a more standard size thread for .45 ACP. As for who, couldn't tell you, I haven't looked into solvent traps myself. Of course I might be wrong, if so I will be corrected soon enough.