I've recently bought the Sig P226 Tacops with a threade barrel. Afte going to the range and just carrying the pistol with me I've noticed the thread protector comes loose fairly easily. After researching the issue I've tried a couple of solutions that just turned out to be temporary fixes. I've tried putting an O-ring on the barrel and it held for the session I fired it with but when I went to remove the tread protector to clean it it had melted the O-ring and it fell apart. Next I tried some teflon tape for pipe joints and that held for a bit but never seemed to secure it enough. I've looked into washers that are supposedly acceptable for this issue but have no idea where I could pick one up at. Any ideas?